ixgbevf: clean up some inconsistent indenting

Eliminate the follow smatch warning:
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:2756
ixgbevf_alloc_q_vector() warn: inconsistent indenting

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>