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possible vsprintf/vsnprintf bug

Hi,

Was doing some logging using my own custom IOLog function which in the end call IOLog. see following.

void MyIOLog( char *DebugMessage, ... )
{
char DebugBuffer[256];

va_list ap;
va_start(ap,DebugMessage);

DebugBuffer[0] = '\0';

vsnprintf( DebugBuffer, 256, DebugMessage, ap );
va_end(ap);

IOLog(DebugBuffer);
}

for example:
unsigned long ulTest = 12345678;
unsigned long *pulTest = &ulTest; /// for example the address == 0xABCDEF00

MyIOLog("Test 0x%lX = %ld \n", (unsigned long)pulTest, *pulTest);
IOLog("Test 0x%lX = %ld \n", (unsigned long)pulTest, *pulTest);

With the previous example the IOLog will output
Test 0xABCDEF00 = 12345678

But the MyIOLog line will do something very nasty like
Test 0xA = 75689000
which obviously does not make any sense.

The problem seem to be coming from the 'X' argument, if you replace it by 'x' the output looks fine.
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