patch 9.2.0309: Missing out-of-memory check to may_get_cmd_block()

Problem:  Missing out-of-memory check to may_get_cmd_block()
Solution: Return p unchanged in case of out-of-memory (John Marriott)

closes: #19906

Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/usercmd.c

@@ -1240,6 +1240,8 @@ may_get_cmd_block(exarg_T *eap, char_u *p, char_u **tofree, int *flags)
 	    }
 	vim_free(line);
 	retp = *tofree = ga_concat_strings(&ga, "\n");
+	if (retp == NULL)
+	    retp = p;
 	ga_clear_strings(&ga);
 	*flags |= UC_VIM9;
     }

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    309,
 /**/
     308,
 /**/