xfs: reflow the tail end of xfs_rtallocate_extent_block

Change polarity of a check so that the successful case of being able to
allocate an extent is in the main path of the function and error handling
is on a branch.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

fs/xfs/xfs_rtalloc.c

@@ -289,36 +289,38 @@ xfs_rtallocate_extent_block(
 		if (error)
 			return error;
 	}
+
 	/*
 	 * Searched the whole thing & didn't find a maxlen free extent.
 	 */
-	if (minlen <= maxlen && besti != -1) {
-		xfs_rtxlen_t	p;	/* amount to trim length by */
-
+	if (minlen > maxlen || besti == -1) {
 		/*
-		 * If size should be a multiple of prod, make that so.
+		 * Allocation failed.  Set *nextp to the next block to try.
 		 */
-		if (prod > 1) {
-			div_u64_rem(bestlen, prod, &p);
-			if (p)
-				bestlen -= p;
-		}
+		*nextp = next;
+		return -ENOSPC;
+	}
 
-		/*
-		 * Allocate besti for bestlen & return that.
-		 */
-		error = xfs_rtallocate_range(args, besti, bestlen);
-		if (error)
-			return error;
-		*len = bestlen;
-		*rtx = besti;
-		return 0;
+	/*
+	 * If size should be a multiple of prod, make that so.
+	 */
+	if (prod > 1) {
+		xfs_rtxlen_t	p;	/* amount to trim length by */
+
+		div_u64_rem(bestlen, prod, &p);
+		if (p)
+			bestlen -= p;
 	}
+
 	/*
-	 * Allocation failed.  Set *nextp to the next block to try.
+	 * Allocate besti for bestlen & return that.
 	 */
-	*nextp = next;
-	return -ENOSPC;
+	error = xfs_rtallocate_range(args, besti, bestlen);
+	if (error)
+		return error;
+	*len = bestlen;
+	*rtx = besti;
+	return 0;
 }
 
 /*