[PATCH] Style: fix function declaration

Hi,
Fix function declaration .

Best regards,
Ranier Vilela

--- \dll\postgresql\a\backend\utils\adt\mac8.c	2019-11-23 13:19:20.000000000 -0300
+++ mac8.c	2019-11-24 09:41:34.200458700 -0300
@@ -35,7 +35,7 @@
 #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,