mesa/main: remove incorrect debug-output

This message was incorrect from the time it was introduced; the function
can return other error messages. If that happened in reality or not was
a bit more unsure, but that's not a good reason to make a blanket
statement like this. In either case, we do track properly now, and we
have for a long time.

The other, similar message in this function is correct.

Fixes: 916bc4491a ("mesa: Implement proper tracking logic for glGetGraphicsResetStatusARB")
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Eric R. Smith <eric.smith@collabora.com>
(cherry picked from commit afe3f28013)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41540>

.pick_status.json

@@ -864,7 +864,7 @@
         "description": "mesa/main: remove incorrect debug-output",
         "nominated": true,
         "nomination_type": 2,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "916bc4491a2a7607bf2bd22aa1a5a537285c89c9",
         "notes": null

src/mesa/main/robustness.c

@@ -140,10 +140,5 @@ _mesa_GetGraphicsResetStatusARB( void )
    if (status != GL_NO_ERROR)
       _mesa_set_context_lost_dispatch(ctx);
 
-   if (!ctx->Driver.GetGraphicsResetStatus && (MESA_VERBOSE & VERBOSE_API))
-      _mesa_debug(ctx,
-                  "glGetGraphicsResetStatusARB always returns GL_NO_ERROR "
-                  "because the driver doesn't track reset status.\n");
-
    return status;
 }