Fix inconsistent variable name in static function of mac8.c
Both argument names were reversed in the declaration of the function.
Author: Ranier Vilela
Discussion:
#define lobits(addr) \
((unsigned long)(((addr)->e<<24) | ((addr)->f<<16) | ((addr)->g<<8) | ((addr)->h)))
-static unsigned char hex2_to_uchar(const unsigned char *str, const unsigned char *ptr);
+static unsigned char hex2_to_uchar(const unsigned char *ptr, const unsigned char *str);
static const signed char hexlookup[128] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
