This fixes an incorrect error message log statement for IPv4 vs.
IPv6 in several net samples.
The error message is in a portion of the files dealing with IPv4
bring-up. If the address is invalid, it logs the invalid address;
however, the IPv4 statement incorrectly refers to ipv6_addr. This
PR corrects it to output ipv4_addr as expected.
Signed-off-by: Steve Winslow <steve@swinslow.net>
476e9e80d1