engine: filesystem: add an error message if we're trying to get a handle of a compressed file in ZIP archive

engine/common/filesystem.c

@@ -2348,7 +2348,10 @@ file_t *FS_OpenZipFile( zip_t *zip, int pack_ind )
 
 	// compressed files handled in Zip_LoadFile
 	if( pfile->flags != ZIP_COMPRESSION_NO_COMPRESSION )
+	{
+		Con_Printf( S_ERROR "%s: can't open compressed file %s", __FUNCTION__, pfile->name );
 		return NULL;
+	}
 
 	return FS_OpenHandle( zip->filename, zip->handle, pfile->offset, pfile->size );
 }