Use seperate ATTR_NON_NULL_PTR_ARG() decorators in the XMEGA TWI driver to prevent Doxygen from choking.

LUFA/DoxygenPages/ChangeLog.txt

@@ -14,6 +14,7 @@
   *   - Added new Printer Device Class driver
   *   - Added support for the XMEGA C3 Xplained board
   *   - Added support for the U2S board (thanks to megal0maniac)
+  *   - Added TWI Master driver for the XMEGA architecture (thanks to Michael Janssen)
   *  - Library Applications:
   *   - Added new Printer class bootloader
   *   - Added new Mass Storage class bootloader

LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.h

@@ -247,7 +247,7 @@
 			 */
 			bool TWI_ReceiveByte(TWI_t* const TWI,
 			                     uint8_t* const Byte,
-			                     const bool LastByte) ATTR_NON_NULL_PTR_ARG(1, 2);
+			                     const bool LastByte) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
 
 			/** High level function to perform a complete packet transfer over the TWI bus to the specified
 			 *  device.
@@ -268,7 +268,7 @@
 			                       const uint8_t* InternalAddress,
 			                       uint8_t InternalAddressLen,
 			                       uint8_t* Buffer,
-			                       uint8_t Length) ATTR_NON_NULL_PTR_ARG(1, 4);
+			                       uint8_t Length) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(4);
 
 			/** High level function to perform a complete packet transfer over the TWI bus from the specified
 			 *  device.
@@ -289,7 +289,7 @@
 			                        const uint8_t* InternalAddress,
 			                        uint8_t InternalAddressLen,
 			                        const uint8_t* Buffer,
-			                        uint8_t Length) ATTR_NON_NULL_PTR_ARG(1, 4);
+			                        uint8_t Length) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(4);
 
 	/* Disable C linkage for C++ Compilers: */
 		#if defined(__cplusplus)