[PATCH] staging: rtl8192e: use explicitly signed char

["Jason A. Donenfeld" <Jason@zx2c4.com>]

With char becoming unsigned by default, and with `char` alone being
ambiguous and based on architecture, signed chars need to be marked
explicitly as such. In this case, passing `char *extra` is part of the
iw API, and that extra is mostly intended to be somewhat opaque. So just
cast to `s8 *` for the sign test. This fixes warnings like:

drivers/staging/rtl8192e/rtllib_softmac_wx.c:459 rtllib_wx_set_essid() warn: impossible condition '(extra[i] < 0) => (0-255 < 0)'

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 drivers/staging/rtl8192e/rtllib_softmac_wx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8192e/rtllib_softmac_wx.c b/drivers/staging/rtl8192e/rtllib_softmac_wx.c
index f9589c5b62ba..4563e3b5bd47 100644
--- a/drivers/staging/rtl8192e/rtllib_softmac_wx.c
+++ b/drivers/staging/rtl8192e/rtllib_softmac_wx.c
@@ -456,7 +456,7 @@ int rtllib_wx_set_essid(struct rtllib_device *ieee,
 	}
 
 	for (i = 0; i < len; i++) {
-		if (extra[i] < 0) {
+		if (((s8 *)extra)[i] < 0) {
 			ret = -1;
 			goto out;
 		}
-- 
2.38.1