Clear off a few compiler warnings generated when pedantic warnings are switched on.

Demo/MicroBlaze_Spartan-6_EthernetLite/SDKProjects/RTOSDemoSource/FreeRTOS_Source/portable/GCC/MicroBlaze/port_exceptions.c

@@ -116,6 +116,8 @@ implementation will be called instead. */
 extern void vApplicationExceptionRegisterDump( xPortRegisterDump *xRegisterDump ) __attribute__((weak));
 void vApplicationExceptionRegisterDump( xPortRegisterDump *xRegisterDump )
 {
+	( void ) xRegisterDump;
+
 	for( ;; )
 	{
 		portNOP();

Demo/MicroBlaze_Spartan-6_EthernetLite/SDKProjects/RTOSDemoSource/FreeRTOS_Source/portable/GCC/MicroBlaze/portasm.S

@@ -71,6 +71,7 @@ back into the caller stack. */
 	#define portMINUS_CONTEXT_SIZE -136
 #else
 	#define portCONTEXT_SIZE 132
+	#define portMINUS_CONTEXT_SIZE -132
 #endif
 
 /* Offsets from the stack pointer at which saved registers are placed. */