radv: fix a memleak for merged shaders on GFX9

modules[i] can be NULL for merged shaders but we have to
free the NIR code. radv_can_dump_shader_stats() already handles
if modules[i] is NULL, no need to check it twice.

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_pipeline.c

@@ -2160,7 +2160,7 @@ void radv_create_shaders(struct radv_pipeline *pipeline,
 
 	for (int i = 0; i < MESA_SHADER_STAGES; ++i) {
 		free(codes[i]);
-		if (modules[i]) {
+		if (nir[i]) {
 			if (!pipeline->device->keep_shader_info)
 				ralloc_free(nir[i]);