filebundle: reverse changes made in PR283

The zlib input buffer is not defined const, therefore the extra malloc/memcpy
is required.

src/filebundle.c

@@ -78,16 +78,18 @@ static uint8_t *_fb_inflate ( const uint8_t *data, size_t size, size_t orig )
 {
   int err;
   z_stream zstr;
-  uint8_t *bufout;
+  uint8_t *bufin, *bufout;
 
   /* Setup buffers */
+  bufin  = malloc(size);
   bufout = malloc(orig);
+  memcpy(bufin, data, size);
 
   /* Setup zlib */
   memset(&zstr, 0, sizeof(zstr));
   inflateInit2(&zstr, 31);
   zstr.avail_in  = size;
-  zstr.next_in   = data;
+  zstr.next_in   = bufin;
   zstr.avail_out = orig;
   zstr.next_out  = bufout;
     
@@ -97,7 +99,7 @@ static uint8_t *_fb_inflate ( const uint8_t *data, size_t size, size_t orig )
     free(bufout);
     bufout = NULL;
   }
-
+  free(bufin);
   inflateEnd(&zstr);
   
   return bufout;