staging/rtl8192e: avoid comparing unsigned type >= 0

There is one remaining warning about a type limit check in rtl8192e:

staging/rtl8192e/rtl819x_TSProc.c:326:14: error: comparison is always true due to limited range of data type [-Werror=type-limits]

This changes a macro into a local function to clarify the types and simplify
the check while removing the warning.

Signed-off-by: Arnd Bergmann <[e-mail]>
Acked-by: Jes Sorensen <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8192e/rtl819x_Qos.h

···
 	} TYPE2_8021Q;
 };
 
-#define IsACValid(ac)		((ac >= 0 && ac <= 7) ? true : false)
-
-
 union aci_aifsn {
 	u8	charData;
 

drivers/staging/rtl8192e/rtl819x_TSProc.c

···
 	pTsCommonInfo->TClasNum = TCLAS_Num;
 }
 
+static bool IsACValid(unsigned int tid)
+{
+	return tid < 7;
+}
+
 bool GetTs(struct rtllib_device *ieee, struct ts_common_info **ppTS,
 	   u8 *Addr, u8 TID, enum tr_select TxRxSelect, bool bAddNewTs)
 {