tsnep: Fix unused warning for 'tsnep_of_match'

Kernel test robot found the following warning:

drivers/net/ethernet/engleder/tsnep_main.c:1254:34: warning:
'tsnep_of_match' defined but not used [-Wunused-const-variable=]

of_match_ptr() compiles into NULL if CONFIG_OF is disabled.
tsnep_of_match exists always so use of of_match_ptr() is useless.
Fix warning by dropping of_match_ptr().
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/engleder/tsnep_main.c

@@ -1282,7 +1282,7 @@ MODULE_DEVICE_TABLE(of, tsnep_of_match);
 static struct platform_driver tsnep_driver = {
 	.driver = {
 		.name = TSNEP,
-		.of_match_table = of_match_ptr(tsnep_of_match),
+		.of_match_table = tsnep_of_match,
 	},
 	.probe = tsnep_probe,
 	.remove = tsnep_remove,