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Restore the 3.x behavior of an empty -I '' argument.
Bug: http://bugs.marples.name/show_bug.cgi?id=116
Patch: http://bugs.marples.name/attachment.cgi?id=56
diff --git a/dhcpcd.c b/dhcpcd.c
index 0219b02..d492a2d 100644
--- a/dhcpcd.c
+++ b/dhcpcd.c
@@ -511,7 +511,7 @@ parse_option(int opt, char *oarg, struct options *options)
case 'I':
/* Strings have a type of 0 */;
options->clientid[1] = 0;
- if (oarg)
+ if (oarg && *oarg)
s = parse_string_hwaddr((char *)options->clientid + 1,
CLIENTID_MAX_LEN, oarg, 1);
else
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