fix returning scalar values

```zig
export fn entry1() i32 {
    return bar();
}
```

```llvm
define i32 @entry1() #2 !dbg !35 {
Entry:
  %0 = call fastcc i32 @bar(), !dbg !39
  ret i32 %0, !dbg !41
}
```

1 files changed, 2 insertions, 1 deletions

diff --git a/src/codegen.cpp b/src/codegen.cpp
index beee678888..a035c6b332 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -3564,7 +3564,8 @@ static LLVMValueRef ir_render_var_ptr(CodeGen *g, IrExecutable *executable, IrIn
 static LLVMValueRef ir_render_return_ptr(CodeGen *g, IrExecutable *executable,
         IrInstructionReturnPtr *instruction)
 {
-    assert(g->cur_ret_ptr != nullptr || !type_has_bits(instruction->base.value.type));
+    src_assert(g->cur_ret_ptr != nullptr || !type_has_bits(instruction->base.value.type),
+            instruction->base.source_node);
     return g->cur_ret_ptr;
 }