check for failure after call to calloc() (issue #8295)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@47232 65c4cc65-6c06-0410-ace0-fbb531ad65f3

utils/check_expr.c

@@ -69,6 +69,8 @@ char *find_var(const char *varname) /* the list should be pretty short, if there
 void set_var(const char *varname, const char *varval)
 {
 	struct varz *t = calloc(1,sizeof(struct varz));
+	if (!t)
+		return;
 	strcpy(t->varname, varname);
 	strcpy(t->varval, varval);
 	t->next = global_varlist;