Staging: rtl8192u: use %s and __func__

Change function's name to %s and __func__ to fix checkpatch.pl errors.
Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20210124144328.121688-1-puranjay12@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/r8190_rtl8256.c

@@ -58,7 +58,7 @@ void phy_set_rf8256_bandwidth(struct net_device *dev, enum ht_channel_width Band
 						(enum rf90_radio_path_e)eRFPath,
 						0x14, bMask12Bits, 0x5ab);
 				} else {
-					RT_TRACE(COMP_ERR, "phy_set_rf8256_bandwidth(): unknown hardware version\n");
+					RT_TRACE(COMP_ERR, "%s(): unknown hardware version\n", __func__);
 					}
 				break;
 		case HT_CHANNEL_WIDTH_20_40: