staging: brcm80211: clean up custom ctype library again

The similar cleanup was done before for softmac implementation.  But the
fullmac driver brings this back. Remove it again.
Signed-off-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmfmac/wl_iw.h

@@ -58,7 +58,6 @@ typedef struct wl_iw_extra_params {
 #define	WL_IW_RSSI_EXCELLENT	-57
 #define	WL_IW_RSSI_INVALID	 0
 #define MAX_WX_STRING 80
-#define isprint(c) bcm_isprint(c)
 #define WL_IW_SET_ACTIVE_SCAN	(SIOCIWFIRSTPRIV+1)
 #define WL_IW_GET_RSSI			(SIOCIWFIRSTPRIV+3)
 #define WL_IW_SET_PASSIVE_SCAN	(SIOCIWFIRSTPRIV+5)