dhclient: fix negative -retry flag
dhclient: fix negative -retry flag

This commit fixes infinite retry (as implied by negative retry value).

Signed-off-by: Ivan Trubach <8478f4bc2009b7f276866e92df0cada71f177e03@icloud.com>

hugelgupf/u-root,GanShun/u-root,u-root/u-root,hugelgupf/u-root,hugelgupf/u-root,GanShun/u-root,u-root/u-root,hugelgupf/u-root,u-root/u-root,GanShun/u-root