staging: fix rtl8192e build errors

drivers/staging/rtl8192e/rtllib.h:2329: error: field 'wx_sem' has incomplete type
drivers/staging/rtl8192e/rtllib.h:2330: error: field 'scan_sem' has incomplete type
drivers/staging/rtl8192e/rtllib.h:2331: error: field 'ips_sem' has incomplete type
drivers/staging/rtl8192e/rtllib_wx.c:267: error: implicit declaration of function 'down'
drivers/staging/rtl8192e/rtllib_wx.c:290: error: implicit declaration of function 'up'
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rtl8192e/rtllib.h

@@ -31,6 +31,7 @@
 #include <linux/jiffies.h>
 #include <linux/timer.h>
 #include <linux/sched.h>
+#include <linux/semaphore.h>
 
 #include <linux/delay.h>
 #include <linux/wireless.h>