wifi: rtl8xxxu: Remove always true condition in rtl8xxxu_print_chipinfo

Fix a new smatch warning:
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c:1580 rtl8xxxu_print_chipinfo() warn: always true condition '(priv->chip_cut <= 15) => (0-15 <= 15)'
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202302140753.71IgU77A-lkp@intel.com/
Fixes: 7b0ac469 ("wifi: rtl8xxxu: Recognise all possible chip cuts")
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/68eff98b-a022-5a00-f330-adf623a35772@gmail.com

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c

@@ -1575,11 +1575,7 @@ rtl8xxxu_set_spec_sifs(struct rtl8xxxu_priv *priv, u16 cck, u16 ofdm)
 static void rtl8xxxu_print_chipinfo(struct rtl8xxxu_priv *priv)
 {
 	struct device *dev = &priv->udev->dev;
-	char cut = '?';
-
-	/* Currently always true: chip_cut is 4 bits. */
-	if (priv->chip_cut <= 15)
-		cut = 'A' + priv->chip_cut;
+	char cut = 'A' + priv->chip_cut;
 
 	dev_info(dev,
 		 "RTL%s rev %c (%s) romver %d, %iT%iR, TX queues %i, WiFi=%i, BT=%i, GPS=%i, HI PA=%i\n",