pan/genxml: fall back to stderr when unable to create CS dump file

This avoids native crash on Android when system priviledged process is
involved during app launch animation but does not have specified storage
access (e.g. system_server can't access the common location /sdcard/*).

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37729>

src/panfrost/genxml/decode_common.c

@@ -267,6 +267,16 @@ pandecode_dump_file_open(struct pandecode_context *ctx)
       if (!ctx->dump_stream) {
          mesa_loge("pandecode: failed to open command stream log file %s",
                    buffer);
+
+         /* Storage access on Android is quite restricted and varies across
+          * different processes. Meanwhile, PANDECODE_DUMP_FILE option is
+          * global on Android. So we have to fallback to log command stream to
+          * stderr (though won't show up in Android logcat) for those unable to
+          * create the dump file but involved during app launch animation (e.g.
+          * system_server priviledged process).
+          */
+         mesa_loge("pandecode: fall back to log command stream to stderr");
+         ctx->dump_stream = stderr;
       }
    }
 }