libzfs: import: zpool_clear_label: bool for boolean status

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13304

lib/libzfs/libzfs_import.c

@@ -138,8 +138,8 @@ zpool_clear_label(int fd)
 	int l;
 	vdev_label_t *label;
 	uint64_t size;
-	int labels_cleared = 0;
-	boolean_t clear_l2arc_header = B_FALSE, header_cleared = B_FALSE;
+	boolean_t labels_cleared = B_FALSE, clear_l2arc_header = B_FALSE,
+	    header_cleared = B_FALSE;
 
 	if (fstat64_blk(fd, &statbuf) == -1)
 		return (0);
@@ -198,9 +198,8 @@ zpool_clear_label(int fd)
 		size_t label_size = sizeof (vdev_label_t) - (2 * VDEV_PAD_SIZE);
 
 		if (pwrite64(fd, label, label_size, label_offset(size, l) +
-		    (2 * VDEV_PAD_SIZE)) == label_size) {
-			labels_cleared++;
-		}
+		    (2 * VDEV_PAD_SIZE)) == label_size)
+			labels_cleared = B_TRUE;
 	}
 
 	if (clear_l2arc_header) {
@@ -214,10 +213,7 @@ zpool_clear_label(int fd)
 
 	free(label);
 
-	if (labels_cleared == 0)
-		return (-1);
-
-	if (clear_l2arc_header && !header_cleared)
+	if (!labels_cleared || (clear_l2arc_header && !header_cleared))
 		return (-1);
 
 	return (0);