wireless: remove redundant tests on unsigned

bufsize and remainder are unsigned. When negative they are wrapped and caught by
the other test.

Signed-off-by: Roel Kluin <[e-mail]>
Signed-off-by: Pavel Roskin <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/orinoco/hermes.c

···
 	u16 rlength, rtype;
 	unsigned nwords;
 
-	if ((bufsize < 0) || (bufsize % 2))
+	if (bufsize % 2)
 		return -EINVAL;
 
 	err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, NULL);

drivers/net/wireless/rtl818x/rtl8180_dev.c

···
 				(ieee80211_get_tx_rate(dev, info)->bitrate * 2) / 10);
 		remainder = (16 * (skb->len + 4)) %
 			    ((ieee80211_get_tx_rate(dev, info)->bitrate * 2) / 10);
-		if (remainder > 0 && remainder <= 6)
+		if (remainder <= 6)
 			plcp_len |= 1 << 15;
 	}