[Libvir] [PATCH] Fix MAC address parsing for 1-digit case

[Hiroyuki Kaguchi]

Hi, Jim and Rich

Thank you for your suggestions.
I apply the following changes to the patch.
1) Initialize errno to 0 before the loop.
2) Use isxdigit instead of isdigit and isalpha, and add a comment.
3) Test errno != 0.
4) Add a terminating NUL check.
5) the MAC address function go in file src/util.c.

Thanks,

Signed-off-by: Hiroyuki Kaguchi <fj7025cf at aa.jp.fujitsu.com>
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