qlcnic: prevent ->dcb use-after-free on qlcnic_dcb_enable() failure

In the Linux kernel, the following vulnerability has been resolved:

qlcnic: prevent ->dcb use-after-free on qlcnic_dcb_enable() failure

adapter->dcb would get silently freed inside qlcnic_dcb_enable() in

case qlcnic_dcb_attach() would return an error, which always happens

under OOM conditions. This would lead to use-after-free because both

of the existing callers invoke qlcnic_dcb_get_info() on the obtained

pointer, which is potentially freed at that point.

Propagate errors from qlcnic_dcb_enable(), and instead free the dcb

pointer at callsite using qlcnic_dcb_free(). This also removes the now

unused qlcnic_clear_dcb_ops() helper, which was a simple wrapper around

kfree() also causing memory leaks for partially initialized dcb.

Found by Linux Verification Center (linuxtesting.org) with the SVACE

static analysis tool.