staging: rtl8723bs: simplify function selecting channel group

simplify function Hal_GetChnlGroup8723B(). It returns
an unused and unnecessary bool value telling which
band the device works on. Since we work only on
2.4Ghz band and the useful return value is the
second function argument we convert the return type to
void.

remove 5Ghz dead code either (for channel > 14).
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/a5536788004c44fe819c0eab0d19504824af46cd.1626874164.git.fabioaiuto83@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c

@@ -2061,56 +2061,18 @@ s32 rtl8723b_InitLLTTable(struct adapter *padapter)
 	return ret;
 }
 
-static bool Hal_GetChnlGroup8723B(u8 Channel, u8 *pGroup)
-{
-	bool bIn24G = true;
-
-	if (Channel <= 14) {
-		bIn24G = true;
-
-		if (1  <= Channel && Channel <= 2)
-			*pGroup = 0;
-		else if (3  <= Channel && Channel <= 5)
-			*pGroup = 1;
-		else if (6  <= Channel && Channel <= 8)
-			*pGroup = 2;
-		else if (9  <= Channel && Channel <= 11)
-			*pGroup = 3;
-		else if (12 <= Channel && Channel <= 14)
-			*pGroup = 4;
-	} else {
-		bIn24G = false;
-
-		if (36   <= Channel && Channel <=  42)
-			*pGroup = 0;
-		else if (44   <= Channel && Channel <=  48)
-			*pGroup = 1;
-		else if (50   <= Channel && Channel <=  58)
-			*pGroup = 2;
-		else if (60   <= Channel && Channel <=  64)
-			*pGroup = 3;
-		else if (100  <= Channel && Channel <= 106)
-			*pGroup = 4;
-		else if (108  <= Channel && Channel <= 114)
-			*pGroup = 5;
-		else if (116  <= Channel && Channel <= 122)
-			*pGroup = 6;
-		else if (124  <= Channel && Channel <= 130)
-			*pGroup = 7;
-		else if (132  <= Channel && Channel <= 138)
-			*pGroup = 8;
-		else if (140  <= Channel && Channel <= 144)
-			*pGroup = 9;
-		else if (149  <= Channel && Channel <= 155)
-			*pGroup = 10;
-		else if (157  <= Channel && Channel <= 161)
-			*pGroup = 11;
-		else if (165  <= Channel && Channel <= 171)
-			*pGroup = 12;
-		else if (173  <= Channel && Channel <= 177)
-			*pGroup = 13;
-	}
-	return bIn24G;
+static void Hal_GetChnlGroup8723B(u8 Channel, u8 *pGroup)
+{
+	if (1  <= Channel && Channel <= 2)
+		*pGroup = 0;
+	else if (3  <= Channel && Channel <= 5)
+		*pGroup = 1;
+	else if (6  <= Channel && Channel <= 8)
+		*pGroup = 2;
+	else if (9  <= Channel && Channel <= 11)
+		*pGroup = 3;
+	else if (12 <= Channel && Channel <= 14)
+		*pGroup = 4;
 }
 
 void Hal_InitPGData(struct adapter *padapter, u8 *PROMContent)