patch 8.0.0799: missing semicolon

Problem:    Missing semicolon.
Solution:   Add it.
diff --git a/src/terminal.c b/src/terminal.c
index aba3d45..9e14b43 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -1607,7 +1607,7 @@
     term->tl_winpty_config = NULL;
     if (term->tl_vterm != NULL)
 	vterm_free(term->tl_vterm);
-    term->tl_vterm = NULL
+    term->tl_vterm = NULL;
 }
 
 /*