staging: rtl8723bs: fix check allowing 5Ghz settings

fix check allowing 5Ghz settings, only disabled and
2.4Ghz enabled states are allowed. Fix comment
accordingly.

Acked-by: Hans de Goede <[e-mail]>
Signed-off-by: Fabio Aiuto <[e-mail]>
Link: https://lore.kernel.org/r/df7d[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8723bs/os_dep/ioctl_linux.c

···
 				case 0x12: /* set rx_stbc */
 				{
 					struct registry_priv *pregpriv = &padapter->registrypriv;
-					/*  0: disable, bit(0):enable 2.4g, bit(1):enable 5g, 0x3: enable both 2.4g and 5g */
-					/* default is set to enable 2.4GHZ for IOT issue with bufflao's AP at 5GHZ */
-					if (extra_arg == 0 || extra_arg == 1 ||
-					    extra_arg == 2 || extra_arg == 3)
+					/*  0: disable, bit(0):enable 2.4g */
+					/* default is set to enable 2.4GHZ */
+					if (extra_arg == 0 || extra_arg == 1)
 						pregpriv->rx_stbc = extra_arg;
 				}
 				break;