From 38811472107195d58b44db6453e4988ac272bba5 Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Sat, 18 Jan 2025 15:23:37 +0900
Subject: [PATCH] [qfcc] Check return value for null in has_function_call

Avoids a segfault when dagging. I'm not sure how a switch statement got
into the dags, but still don't want a segfault there.
---
 tools/qfcc/source/expr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/qfcc/source/expr.c b/tools/qfcc/source/expr.c
index cac6c51c1..b1267acdc 100644
--- a/tools/qfcc/source/expr.c
+++ b/tools/qfcc/source/expr.c
@@ -1943,6 +1943,10 @@ has_function_call (const expr_t *e)
 			// in is just a cast of out, if it's not null
 			return has_function_call (e->inout.out);
 		case ex_return:
+			if (!e->retrn.ret_val) {
+				// if there's no return value, can't possibly have a call
+				return false;
+			}
 			return has_function_call (e->retrn.ret_val);
 		case ex_horizontal:
 			return has_function_call (e->hop.vec);