Merge pull request Arduino-IRremote#233 from ram-0000/patch-1

Update ir_Aiwa.cpp

Author: z3t0

ir_Aiwa.cpp

@@ -28,7 +28,6 @@
 void IRsend::sendAiwaRCT501 (int code)
 {
 unsigned long pre = 0x0227EEC0; // 26-bits
-int mask;
 
 // Set IR carrier frequency
 enableIROut(AIWA_RC_T501_HZ);