[Toybox] [PATCH] Fix bug in 'xxd' for upper-case characters

[Zach van Rijn]

This patch fixes what I imagine is a typo in 'xxd', quickly
verified by the following program:

$ cat xxd_bug.c
#include <stdio.h>

int dehex(char ch)
{
  if (ch >= '0' && ch <= '9') return ch - '0';
  if (ch >= 'a' && ch <= 'f') return ch - 'a' + 10;
  if (ch >= 'A' && ch <= 'F') return ch - 'a' + 10;
  return (ch == '\n') ? -2 : -1;
}

int main(int c, char **v)
{
  printf("%d\n", dehex(v[1][0]));
  return 0;
}

$ ./xxd_bug a
10
$ ./xxd_bug A
-22

After applying the patch, return values are identical.

ZV
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