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/edit.c b/src/edit.c
index c6b0619..a522fe9 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -4653,7 +4653,7 @@
 		    found_new_match = search_for_exact_line(ins_buf, pos,
 					      compl_direction, compl_pattern);
 		else
-		    found_new_match = searchit(NULL, ins_buf, pos,
+		    found_new_match = searchit(NULL, ins_buf, pos, NULL,
 							      compl_direction,
 				 compl_pattern, 1L, SEARCH_KEEP + SEARCH_NFMSG,
 					     RE_LAST, (linenr_T)0, NULL, NULL);