Updated SDL2 to the latest Mercurial revision.

libs/SDL2/src/filesystem/emscripten/SDL_sysfilesystem.c

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -57,6 +57,7 @@ SDL_GetPrefPath(const char *org, const char *app)
 
     if (mkdir(retval, 0700) != 0 && errno != EEXIST) {
         SDL_SetError("Couldn't create directory '%s': '%s'", retval, strerror(errno));
+        SDL_free(retval);
         return NULL;
     }