i40e: prevent memory leak in i40e_setup_macvlans

i40e: prevent memory leak in i40e_setup_macvlans

BugLink: https://bugs.launchpad.net/bugs/1862429
[ Upstream commit 27d461333459d282ffa4a2bdb6b215a59d493a8f ]

In i40e_setup_macvlans if i40e_setup_channel fails the allocated memory
for ch should be released.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>