staging: r8188eu: use strscpy() to instead of strncpy()

The implementation of strscpy() is more robust and safer.
That's now the recommended way to copy NUL-terminated strings.
Signed-off-by: Xu Panda <xu.panda@zte.com.cn>
Signed-off-by: Yang Yang <yang.yang29@zte.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/202212261905476729002@zte.com.cnSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/os_dep/ioctl_linux.c

@@ -3061,8 +3061,7 @@ static int rtw_rereg_nd_name(struct net_device *dev,
 		char *reg_ifname;
 		reg_ifname = padapter->registrypriv.if2name;
 
-		strncpy(rereg_priv->old_ifname, reg_ifname, IFNAMSIZ);
-		rereg_priv->old_ifname[IFNAMSIZ - 1] = 0;
+		strscpy(rereg_priv->old_ifname, reg_ifname, IFNAMSIZ);
 	}
 
 	if (wrqu->data.length > IFNAMSIZ)
@@ -3084,8 +3083,7 @@ static int rtw_rereg_nd_name(struct net_device *dev,
 		rtw_ips_mode_req(&padapter->pwrctrlpriv, rereg_priv->old_ips_mode);
 	}
 
-	strncpy(rereg_priv->old_ifname, new_ifname, IFNAMSIZ);
-	rereg_priv->old_ifname[IFNAMSIZ - 1] = 0;
+	strscpy(rereg_priv->old_ifname, new_ifname, IFNAMSIZ);
 
 	if (!memcmp(new_ifname, "disable%d", 9)) {
 		/*  free network queue for Android's timming issue */