Remove trailing whitespace from Python files

plugins/USBPrinting/avr_isp/intelHex.py

@@ -31,7 +31,7 @@ def readHex(filename):
         check_sum &= 0xFF
         if check_sum != 0:
             raise Exception("Checksum error in hex file: " + line)
-        
+
         if rec_type == 0:#Data record
             while len(data) < addr + rec_len:
                 data.append(0)

plugins/USBPrinting/avr_isp/ispBase.py

@@ -22,7 +22,7 @@ class IspBase():
         if not self.chip:
             raise IspError("Chip with signature: " + str(self.getSignature()) + "not found")
         self.chipErase()
-        
+
         Logger.log("d", "Flashing %i bytes", len(flash_data))
         self.writeFlash(flash_data)
         Logger.log("d", "Verifying %i bytes", len(flash_data))

plugins/USBPrinting/avr_isp/stk500v2.py

@@ -56,7 +56,7 @@ class Stk500v2(ispBase.IspBase):
             self.close()
             raise
         self.serial.timeout = 5
- 
+
     def close(self):
         if self.serial is not None:
             self.serial.close()