staging: rtl8723bs: hal: Compress return logic

Simplify function returns by merging assignment and return into
one command line.
Found with Coccinelle

@@
local idexpression ret;
expression e;
@@

-ret =
+return
     e;
-return ret;
Signed-off-by: Simran Singhal <singhalsimran0@gmail.com>
Link: https://lore.kernel.org/r/20200325214312.GA1936@simran-Inspiron-5558Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/hal/hal_com_phycfg.c

@@ -1498,9 +1498,7 @@ s8 PHY_GetTxPowerByRate(
 		return value;
 	}
 
-	value = pHalData->TxPwrByRateOffset[Band][RFPath][TxNum][rateIndex];
-
-	return value;
+	return pHalData->TxPwrByRateOffset[Band][RFPath][TxNum][rateIndex];
 
 }