xfs: minor cleanup for xfs_get_blocks

Simplify the control flow a bit in preparation for O_ATOMIC-related
changes.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>

fs/xfs/xfs_aops.c

@@ -1335,16 +1335,15 @@ xfs_get_blocks(
 			&nimaps, 0);
 	if (error)
 		goto out_unlock;
+	if (!nimaps) {
+		trace_xfs_get_blocks_notfound(ip, offset, size);
+		goto out_unlock;
+	}
 
-	if (nimaps) {
 	trace_xfs_get_blocks_found(ip, offset, size,
 		imap.br_state == XFS_EXT_UNWRITTEN ?
 			XFS_IO_UNWRITTEN : XFS_IO_OVERWRITE, &imap);
 	xfs_iunlock(ip, lockmode);
-	} else {
-		trace_xfs_get_blocks_notfound(ip, offset, size);
-		goto out_unlock;
-	}
 
 	/* trim mapping down to size requested */
 	xfs_map_trim_size(inode, iblock, bh_result, &imap, offset, size);