fs/ntfs3: Add NULL ptr dereference checking at the end of attr_allocate_frame()

It is preferable to exit through the out: label because
internal debugging functions are located there.
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

fs/ntfs3/attrib.c

@@ -1743,8 +1743,10 @@ int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
 			le_b = NULL;
 			attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL,
 					      0, NULL, &mi_b);
-			if (!attr_b)
-				return -ENOENT;
+			if (!attr_b) {
+				err = -ENOENT;
+				goto out;
+			}
 
 			attr = attr_b;
 			le = le_b;
@@ -1825,6 +1827,7 @@ int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
 ok:
 	run_truncate_around(run, vcn);
 out:
+	if (attr_b) {
 		if (new_valid > data_size)
 			new_valid = data_size;
 
@@ -1833,6 +1836,7 @@ int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
 			attr_b->nres.valid_size = cpu_to_le64(valid_size);
 			mi_b->dirty = true;
 		}
+	}
 
 	return err;
 }