staging: rtl8192u: Remove an unnecessary NULL check

Clang warns:

drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c:2663:47: warning:
address of array 'param->u.wpa_ie.data' will always evaluate to 'true'
[-Wpointer-bool-conversion]
            (param->u.wpa_ie.len && !param->u.wpa_ie.data))
                                    ~~~~~~~~~~~~~~~~~^~~~

This was exposed by commit deabe035 ("Staging: rtl8192u: ieee80211:
Use !x in place of NULL comparisons") because we disable the warning
that would have pointed out the comparison against NULL is also false:

drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c:2663:46: warning:
comparison of array 'param->u.wpa_ie.data' equal to a null pointer is
always false [-Wtautological-pointer-compare]
            (param->u.wpa_ie.len && param->u.wpa_ie.data == NULL))
                                    ~~~~~~~~~~~~~~~~^~~~    ~~~~

Remove it so clang no longer warns.

Link: https://github.com/ClangBuiltLinux/linux/issues/487Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c

@@ -2659,8 +2659,7 @@ static int ieee80211_wpa_set_wpa_ie(struct ieee80211_device *ieee,
 {
 	u8 *buf;
 
-	if (param->u.wpa_ie.len > MAX_WPA_IE_LEN ||
-	    (param->u.wpa_ie.len && !param->u.wpa_ie.data))
+	if (param->u.wpa_ie.len > MAX_WPA_IE_LEN)
 		return -EINVAL;
 
 	if (param->u.wpa_ie.len) {