vorbis warnings from ronny chevalier

I manually made these changes because they
disabled some substantial amounts of code,
and I wanted to make sure this wasn't due to
original code having bugs or deviating from
the specification

stb_vorbis.c

@@ -22,7 +22,7 @@
 // Bugfix/warning contributors:
 //    Terje Mathisen     Niklas Frykholm     Andy Hill
 //    Casey Muratori     John Bolton         Gargaj
-//    Laurent Gomila     Marc LeBlanc
+//    Laurent Gomila     Marc LeBlanc        Ronny Chevalier
 //    Bernhard Wodo      Evan Balster
 //    Tom Beaumont       Ingo Leitgeb
 // (If you reported a bug but do not appear in this list, it is because
@@ -30,7 +30,8 @@
 // list them all because I was lax about updating for a long time, sorry.)
 //
 // Partial history:
-//    1.02    - 2014/07/09 - declare qsort comparison as explicitly _cdecl
+//    1.03    - 2014/08/07 - warning fixes
+//    1.02    - 2014/07/09 - declare qsort comparison as explicitly _cdecl in Windows
 //    1.01    - 2014/06/18 - fix stb_vorbis_get_samples_float (interleaved was correct)
 //    1.0     - 2014/05/26 - fix memory leaks; fix warnings; fix bugs in >2-channel;
 //                           (API change) report sample rate for decode-full-file funcs
@@ -2124,7 +2125,6 @@ static void decode_residue(vorb *f, float *residue_buffers[], int ch, int n, int
          memset(residue_buffers[i], 0, sizeof(float) * n);
 
    if (rtype == 2 && ch != 1) {
-      int len = ch * n;
       for (j=0; j < ch; ++j)
          if (!do_not_decode[j])
             break;
@@ -2674,7 +2674,7 @@ static void imdct_step3_inner_s_loop_ld654(int n, float *e, int i_off, float *A,
 static void inverse_mdct(float *buffer, int n, vorb *f, int blocktype)
 {
    int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l;
-   int n3_4 = n - n4, ld;
+   int ld;
    // @OPTIMIZE: reduce register pressure by using fewer variables?
    int save_point = temp_alloc_save(f);
    float *buf2 = (float *) temp_alloc(f, n2 * sizeof(*buf2));
@@ -3208,13 +3208,10 @@ static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start,
    int i,j,k,n,n2;
    int zero_channel[256];
    int really_zero_channel[256];
-   int window_center;
 
 // WINDOWING
 
    n = f->blocksize[m->blockflag];
-   window_center = n >> 1;
-
    map = &f->mapping[m->mapping];
 
 // FLOORS
@@ -3328,7 +3325,7 @@ static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start,
 // RESIDUE DECODE
    for (i=0; i < map->submaps; ++i) {
       float *residue_buffers[STB_VORBIS_MAX_CHANNELS];
-      int r,t;
+      int r;
       uint8 do_not_decode[256];
       int ch = 0;
       for (j=0; j < f->channels; ++j) {
@@ -3344,7 +3341,6 @@ static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start,
          }
       }
       r = map->submap_residue[i];
-      t = f->residue_types[r];
       decode_residue(f, residue_buffers, ch, n2, r, do_not_decode);
    }
 
@@ -4541,7 +4537,7 @@ static int vorbis_analyze_page(stb_vorbis *f, ProbedPage *z)
 {
    uint8 header[27], lacing[255];
    uint8 packet_type[255];
-   int num_packet, packet_start, previous =0;
+   int num_packet, packet_start;
    int i,len;
    uint32 samples;
 
@@ -4574,7 +4570,7 @@ static int vorbis_analyze_page(stb_vorbis *f, ProbedPage *z)
 
    // scan through the frames to determine the sample-count of each one...
    // our goal is the sample # of the first fully-decoded sample on the
-   // page, which is the first decoded sample of the 2nd page
+   // page, which is the first decoded sample of the 2nd packet
 
    num_packet=0;
 
@@ -4582,18 +4578,15 @@ static int vorbis_analyze_page(stb_vorbis *f, ProbedPage *z)
 
    for (i=0; i < header[26]; ++i) {
       if (packet_start) {
-         uint8 n,b,m;
+         uint8 n,b;
          if (lacing[i] == 0) goto bail; // trying to read from zero-length packet
          n = get8(f);
          // if bottom bit is non-zero, we've got corruption
          if (n & 1) goto bail;
          n >>= 1;
          b = ilog(f->mode_count-1);
-         m = n >> b;
          n &= (1 << b)-1;
          if (n >= f->mode_count) goto bail;
-         if (num_packet == 0 && f->mode_config[n].blockflag)
-            previous = (m & 1);
          packet_type[num_packet++] = f->mode_config[n].blockflag;
          skip(f, lacing[i]-1);
       } else
@@ -5404,6 +5397,8 @@ int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, in
 #endif // STB_VORBIS_NO_PULLDATA_API
 
 /* Version history
+    1.03    - 2014/08/07 - Warning fixes
+    1.02    - 2014/07/09 - Declare qsort compare function _cdecl on windows
     1.01    - 2014/06/18 - fix stb_vorbis_get_samples_float
     1.0     - 2014/05/26 - fix memory leaks; fix warnings; fix bugs in multichannel
                            (API change) report sample rate for decode-full-file funcs