xfs: decrease indenting problems in xfs_dabuf_map

Refactor the code that complains when a dir/attr mapping doesn't exist
but the caller requires a mapping.  This small restructuring helps us to
reduce the indenting level.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/libxfs/xfs_da_btree.c

@@ -2567,26 +2567,30 @@ xfs_dabuf_map(
 	}
 
 	if (!xfs_da_map_covers_blocks(nirecs, irecs, bno, nfsb)) {
-		error = mappedbno == -2 ? -1 : -EFSCORRUPTED;
-		if (unlikely(error == -EFSCORRUPTED)) {
-			if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
-				int i;
-				xfs_alert(mp, "%s: bno %lld dir: inode %lld",
-					__func__, (long long)bno,
-					(long long)dp->i_ino);
-				for (i = 0; i < *nmaps; i++) {
-					xfs_alert(mp,
+		/* Caller ok with no mapping. */
+		if (mappedbno == -2) {
+			error = -1;
+			goto out;
+		}
+
+		/* Caller expected a mapping, so abort. */
+		if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
+			int i;
+
+			xfs_alert(mp, "%s: bno %lld dir: inode %lld", __func__,
+					(long long)bno, (long long)dp->i_ino);
+			for (i = 0; i < *nmaps; i++) {
+				xfs_alert(mp,
 "[%02d] br_startoff %lld br_startblock %lld br_blockcount %lld br_state %d",
-						i,
-						(long long)irecs[i].br_startoff,
-						(long long)irecs[i].br_startblock,
-						(long long)irecs[i].br_blockcount,
-						irecs[i].br_state);
-				}
+					i,
+					(long long)irecs[i].br_startoff,
+					(long long)irecs[i].br_startblock,
+					(long long)irecs[i].br_blockcount,
+					irecs[i].br_state);
 			}
-			XFS_ERROR_REPORT("xfs_da_do_buf(1)",
-					 XFS_ERRLEVEL_LOW, mp);
 		}
+		XFS_ERROR_REPORT("xfs_da_do_buf(1)", XFS_ERRLEVEL_LOW, mp);
+		error = -EFSCORRUPTED;
 		goto out;
 	}
 	error = xfs_buf_map_from_irec(mp, map, nmaps, irecs, nirecs);