staging: rtl8723bs: fix spelling mistake: "nonprintabl" -> "non-printable"

There is a spelling mistake in an RT_TRACE message, fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_ioctl_set.c

@@ -44,7 +44,7 @@ u8 rtw_validate_ssid(struct ndis_802_11_ssid *ssid)
 	for (i = 0; i < ssid->SsidLength; i++) {
 		/* wifi, printable ascii code must be supported */
 		if (!((ssid->Ssid[i] >= 0x20) && (ssid->Ssid[i] <= 0x7e))) {
-			RT_TRACE(_module_rtl871x_ioctl_set_c_, _drv_err_, ("ssid has nonprintabl ascii\n"));
+			RT_TRACE(_module_rtl871x_ioctl_set_c_, _drv_err_, ("ssid has non-printable ascii\n"));
 			ret = false;
 			break;
 		}