Fix breakage in shmem.c

Replacing
error = 0;
if (error)
op
with nothing is not quite an equivalent transformation ;-)

Signed-off-by: Al Viro <[e-mail]>

mm/shmem.c

···
 			iput(inode);
 			return error;
 		}
+#else
+		error = 0;
 #endif
 		if (dir->i_mode & S_ISGID) {
 			inode->i_gid = dir->i_gid;