fix scan_xlong, scan_xlonglong and scan_8long

CHANGES

@@ -3,6 +3,7 @@
   fix a few man pages
   optimize fmt_base64 (Dan Gundlach)
   gcc 4 cleanups (mostly unsigned char* vs char*)
+  fix scan_xlong, scan_xlonglong and scan_8long
 
 0.22:
   uh, the scope_id detection #defined the wrong constant.  libowfat

scan/scan_8long.c

@@ -2,7 +2,7 @@
 
 unsigned int scan_8long(const char *src,unsigned long *dest) {
   register const char *tmp=src;
-  register int l=0;
+  register unsigned long l=0;
   register unsigned char c;
   while ((c=*tmp-'0')<8) {
     l=l*8+c;

scan/scan_xlong.c

@@ -2,7 +2,7 @@
 
 unsigned int scan_xlong(const char *src,unsigned long *dest) {
   register const char *tmp=src;
-  register int l=0;
+  register unsigned long l=0;
   register unsigned char c;
   while ((c=scan_fromhex(*tmp))<16) {
     l=(l<<4)+c;

scan/scan_xlonglong.c

@@ -2,7 +2,7 @@
 
 unsigned int scan_xlonglong(const char* src,unsigned long long* dest) {
   register const char *tmp=src;
-  register int l=0;
+  register long long l=0;
   register unsigned char c;
   while ((c=scan_fromhex(*tmp))<16) {
     l=(l<<4)+c;