tweak indentation

stb_image.h

@@ -580,7 +580,7 @@ STBIDEF int   stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const ch
       #define STBI_THREAD_LOCAL       __thread
    #elif defined(_MSC_VER)
       #define STBI_THREAD_LOCAL       __declspec(thread)
-#endif
+   #endif
 #endif
 
 #ifdef _MSC_VER