aco: Clarify missing export error message in assembler.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6964>
diff --git a/src/amd/compiler/aco_assembler.cpp b/src/amd/compiler/aco_assembler.cpp
index 17a51cd..ac9339c 100644
--- a/src/amd/compiler/aco_assembler.cpp
+++ b/src/amd/compiler/aco_assembler.cpp
@@ -749,7 +749,7 @@
 
    if (!exported) {
       /* Abort in order to avoid a GPU hang. */
-      aco_err(program, "Missing export in %s shader:", (program->stage & hw_vs) ? "vertex" : "fragment");
+      aco_err(program, "Missing export in %s shader:", (program->stage & (hw_vs | hw_ngg_gs)) ? "vertex or NGG" : "fragment");
       aco_print_program(program, stderr);
       abort();
    }