Merged r4121:4122 from branches/SDL-1.2: more double-free fixes.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404362

src/audio/SDL_wave.c

@@ -454,6 +454,7 @@ SDL_LoadWAV_RW(SDL_RWops * src, int freesrc,
     do {
         if (chunk.data != NULL) {
             SDL_free(chunk.data);
+            chunk.data = NULL;
         }
         lenread = ReadChunk(src, &chunk);
         if (lenread < 0) {
@@ -553,6 +554,7 @@ SDL_LoadWAV_RW(SDL_RWops * src, int freesrc,
     do {
         if (*audio_buf != NULL) {
             SDL_free(*audio_buf);
+            *audio_buf = NULL;
         }
         lenread = ReadChunk(src, &chunk);
         if (lenread < 0) {
@@ -625,6 +627,7 @@ ReadChunk(SDL_RWops * src, Chunk * chunk)
     if (SDL_RWread(src, chunk->data, chunk->length, 1) != 1) {
         SDL_Error(SDL_EFREAD);
         SDL_free(chunk->data);
+        chunk->data = NULL;
         return (-1);
     }
     return (chunk->length);

src/events/SDL_events.c

@@ -176,6 +176,7 @@ SDL_StopEventThread(void)
         SDL_WaitThread(SDL_EventThread, NULL);
         SDL_EventThread = NULL;
         SDL_DestroyMutex(SDL_EventLock.lock);
+        SDL_EventLock.lock = NULL;
     }
     if (SDL_EventQ.lock) {
         SDL_DestroyMutex(SDL_EventQ.lock);