nouveau: fix memory leak

In the original code there was a typo and we called kfree(pgraph->ctxprog) two times instead of kfree(pgraph->ctxvals);

Also it's OK to pass NULL variables to kfree(). checkpatch.pl complains about this so I removed the checks.

index 32f0e49..06642a5 100644
@@ -134,15 +134,11 @@ nouveau_grctx_fini(struct drm_device *dev)
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_pgraph_engine *pgraph = &dev_priv->engine.graph;
 
-	if (pgraph->ctxprog) {
-		kfree(pgraph->ctxprog);
-		pgraph->ctxprog = NULL;
-	}
+	kfree(pgraph->ctxprog);
+	pgraph->ctxprog = NULL;
 
-	if (pgraph->ctxvals) {
-		kfree(pgraph->ctxprog);
-		pgraph->ctxvals = NULL;
-	}
+	kfree(pgraph->ctxvals);
+	pgraph->ctxvals = NULL;
 }
 
 void

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