netutils/netlib: fix getipv4addr failure
netutils/netlib: fix getipv4addr failure

fix an issue that netlib_get_ipv4addr() always returns failure because
of wrong if-condition check.

Change-Id: Icca5c0101b442ad4094cc54f041122fdafca269e
Signed-off-by: Siwon Kang <ebec45d95c8f1b394ce3a1fc19033d35a81f3ab6@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT