patch 7.4.922

Problem:    Leaking memory with ":helpt {dir-not-exists}".
Solution:   Free dirname. (Dominique Pelle)

src/ex_cmds.c

@@ -6574,6 +6574,7 @@ ex_helptags(eap)
     if (dirname == NULL || !mch_isdir(dirname))
     {
 	EMSG2(_("E150: Not a directory: %s"), eap->arg);
+	vim_free(dirname);
 	return;
     }
 

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    922,
 /**/
     921,
 /**/