patch 8.2.1991: Coverity warns for not using the ga_grow() return value

Problem:    Coverity warns for not using the ga_grow() return value.
Solution:   Bail out if ga_grow() fails. (Yegappan Lakshmanan, closes #7303)

Author: brammool

src/getchar.c

@@ -3645,7 +3645,11 @@ getcmdkeycmd(
     got_int = FALSE;
     while (c1 != NUL && !aborted)
     {
-	ga_grow(&line_ga, 32);
+	if (ga_grow(&line_ga, 32) != OK)
+	{
+	    aborted = TRUE;
+	    break;
+	}
 
 	if (vgetorpeek(FALSE) == NUL)
 	{

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1991,
 /**/
     1990,
 /**/