[XFS] Catch errors from xfs_imap().

Catch errors from xfs_imap() in log recovery when we might be trying to
map an invalid inode number due to a corrupted log.

SGI-PV: 980084
SGI-Modid: xfs-linux-melb:xfs-kern:30829a
Signed-off-by: NDavid Chinner <dgc@sgi.com>
Signed-off-by: NNiv Sardi <xaiki@sgi.com>
Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>

fs/xfs/xfs_log_recover.c

@@ -2282,7 +2282,9 @@ xlog_recover_do_inode_trans(
 		 * invalidate the buffer when we write it out below.
 		 */
 		imap.im_blkno = 0;
-		xfs_imap(log->l_mp, NULL, ino, &imap, 0);
+		error = xfs_imap(log->l_mp, NULL, ino, &imap, 0);
+		if (error)
+			goto error;
 	}
 
 	/*