btrfs: Small cleanup for get index_srcdev loop

1: Adjust condition in loop to make less TAB
2: Move btrfs_put_bbio()'s line for combine, and makes logic clean.
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

fs/btrfs/volumes.c

@@ -5379,35 +5379,33 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 		 * target drive.
 		 */
 		for (i = 0; i < tmp_num_stripes; i++) {
-			if (tmp_bbio->stripes[i].dev->devid == srcdev_devid) {
+			if (tmp_bbio->stripes[i].dev->devid != srcdev_devid)
+				continue;
+
 			/*
-				 * In case of DUP, in order to keep it
-				 * simple, only add the mirror with the
-				 * lowest physical address
+			 * In case of DUP, in order to keep it simple, only add
+			 * the mirror with the lowest physical address
 			 */
 			if (found &&
-				    physical_of_found <=
-				     tmp_bbio->stripes[i].physical)
+			    physical_of_found <= tmp_bbio->stripes[i].physical)
 				continue;
+
 			index_srcdev = i;
 			found = 1;
-				physical_of_found =
-					tmp_bbio->stripes[i].physical;
-			}
+			physical_of_found = tmp_bbio->stripes[i].physical;
 		}
 
-		if (found) {
-			mirror_num = index_srcdev + 1;
-			patch_the_first_stripe_for_dev_replace = 1;
-			physical_to_patch_in_first_stripe = physical_of_found;
-		} else {
+		btrfs_put_bbio(tmp_bbio);
+
+		if (!found) {
 			WARN_ON(1);
 			ret = -EIO;
-			btrfs_put_bbio(tmp_bbio);
 			goto out;
 		}
 
-		btrfs_put_bbio(tmp_bbio);
+		mirror_num = index_srcdev + 1;
+		patch_the_first_stripe_for_dev_replace = 1;
+		physical_to_patch_in_first_stripe = physical_of_found;
 	} else if (mirror_num > map->num_stripes) {
 		mirror_num = 0;
 	}