
Prevent frag from being freed out from under us in the case the PML callback routine calls usnic_free(). We accomplish this by delaying decrement of sf_bytes_to_ack until after the callback is performed, since sf_bytes_to_ack == 0 is condition of freeing the frag. Fixes Cisco bug CSCuj45094. Authored-by: Reese Faucette <rfaucett@cisco.com> cmr=v1.7.3 This commit was SVN r29264.