radv: fix a memleak when compiling the GS copy shader

Found by inspection.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_pipeline.c

@@ -618,6 +618,8 @@ radv_pipeline_compile(struct radv_pipeline *pipeline,
 								  gs_copy_code,
 								  gs_copy_code_size);
 		}
+
+		free(gs_copy_code);
 	}
 	if (!module->nir)
 		ralloc_free(nir);