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/ex_docmd.c b/src/ex_docmd.c
index d3246f4..67f505d 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -4669,7 +4669,7 @@
 #ifdef FEAT_VIRTUALEDIT
 		    pos.coladd = 0;
 #endif
-		    if (searchit(curwin, curbuf, &pos,
+		    if (searchit(curwin, curbuf, &pos, NULL,
 				*cmd == '?' ? BACKWARD : FORWARD,
 				(char_u *)"", 1L, SEARCH_MSG,
 					i, (linenr_T)0, NULL, NULL) != FAIL)