patch 8.1.0629: "gn" selects the wrong text with a multi-line match

Problem:    "gn" selects the wrong text with a multi-line match.
Solution:   Get the end position from searchit() directly. (closes #3695)
diff --git a/src/normal.c b/src/normal.c
index 5310824..78e3f20 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -4338,7 +4338,7 @@
     for (;;)
     {
 	valid = FALSE;
-	t = searchit(curwin, curbuf, &curwin->w_cursor, FORWARD,
+	t = searchit(curwin, curbuf, &curwin->w_cursor, NULL, FORWARD,
 		       pat, 1L, searchflags, RE_LAST, (linenr_T)0, NULL, NULL);
 	if (curwin->w_cursor.lnum >= old_pos.lnum)
 	    t = FAIL;	/* match after start is failure too */