i40e: Fix memory leak in i40e_probe

Struct i40e_veb is allocated in function i40e_setup_pf_switch, and
stored to an array field veb inside struct i40e_pf. However when
i40e_setup_misc_vector fails, this memory leaks.

Fix this by calling exit and teardown functions.

Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>