music_opus.c: fix a typo. (found with -Wall in CFLAGS).

also update changelog to mention opus support.

Author: sezero

CHANGES.txt

@@ -1,6 +1,8 @@
 2.0.3:
 Ozkan Sezer - Sun, 07 Oct 2018 08:50:02
  * Fixed mp3 mad decoder to skip tags, which otherwise would lead to crashes
+Ozkan Sezer - Fri, 15 Jun 2018 05:32:56
+ * Added support for Opus music playback using opusfile library
 Sam Lantinga - Thu, Mar  1, 2018  9:06:58 AM
  * Fixed regression where Mix_Init() would return 0 for available music formats
 

music_opus.c

@@ -140,7 +140,7 @@ static int sdl_read_func(void *datasource, unsigned char *ptr, int size)
     return (int)SDL_RWread((SDL_RWops*)datasource, ptr, 1, size);
 }
 
-static int sdl_seek_func(void *datasource, ogg_int64_t offset, int whence)
+static int sdl_seek_func(void *datasource, opus_int64  offset, int whence)
 {
     return (SDL_RWseek((SDL_RWops*)datasource, offset, whence) < 0)? -1 : 0;
 }