pv: renamed empty buf variable

(cherry picked from commit cdd7bc29a900d787b8d99f7296306f99c53a5e29)

src/modules/pv/pv_trans.c

@@ -50,8 +50,8 @@
 #include "pv_trans.h"
 
 
-static char _empty_str[2] = {0};
-static str _tr_empty = { _empty_str, 0 };
+static char _tr_empty_buf[2] = {0};
+static str _tr_empty = { _tr_empty_buf, 0 };
 static str _tr_uri = {0, 0};
 static struct sip_uri _tr_parsed_uri;
 static param_t* _tr_uri_params = NULL;