patch 8.0.1768: SET_NO_HLSEARCH() used in a wrong way

Problem:    SET_NO_HLSEARCH() used in a wrong way.
Solution:   Make it a function. (suggested by Dominique Pelle,
            closes #2850)
diff --git a/src/option.c b/src/option.c
index 31aec7e..807b1e0 100644
--- a/src/option.c
+++ b/src/option.c
@@ -8359,7 +8359,7 @@
     /* when 'hlsearch' is set or reset: reset no_hlsearch */
     else if ((int *)varp == &p_hls)
     {
-	SET_NO_HLSEARCH(FALSE);
+	set_no_hlsearch(FALSE);
     }
 #endif