eth: bnxt: free XDP frags when xdp_do_redirect() fails

When xdp_do_redirect() fails bnxt_rx_xdp() recycles the head page but
not the frags of a multi-buffer frame. Their agg ring slots have
already been refilled, so the pages leak, and the page pool can't be
destroyed until they are returned, which will never happen. Redirect
to an AF_XDP socket in copy mode fails this way with -ENOMEM whenever
the socket's fill ring runs out of buffers.
A socket bound without XDP_USE_SG also fails with -ENOSPC for every
frame that doesn't fit in a single chunk.

All the other drop paths in this function free the frags.

Pointed out in LLM review of the first patch of the series.
Tested on a BCM57504 at MTU 9000 by redirecting 60k 8000B ICMPv6
echo requests (a head and two agg buffers each) to lo, which can't
transmit XDP frames. The page pools' inflight count stayed flat
rather than growing by two pages per frame.

Fixes: a7559bc8c17c ("bnxt: support transmit and free of aggregation buffers")
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20261027234940.1267225-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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