zlib/ioapi.c: add 'return's to fopen_file_func and fopen64_file_func

This fixes the 'bad neunon bad' commit (14f562a9). Bad DarkGod, bad, I guess?

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

src/zlib/ioapi.c

@@ -92,6 +92,7 @@ static voidpf ZCALLBACK fopen_file_func (voidpf opaque, const char* filename, in
     else
     if (mode & ZLIB_FILEFUNC_MODE_CREATE)
         file = PHYSFS_openWrite(filename);
+    return file;
 }
 
 static voidpf ZCALLBACK fopen64_file_func (voidpf opaque, const void* filename, int mode)
@@ -105,6 +106,7 @@ static voidpf ZCALLBACK fopen64_file_func (voidpf opaque, const void* filename,
     else
     if (mode & ZLIB_FILEFUNC_MODE_CREATE)
         file = PHYSFS_openWrite(filename);
+    return file;
 }