CVE-2026-74261 ALSA: seq: avoid stale FIFO cells during resize

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: avoid stale FIFO cells during resize sndseqfiforesize still needs to publish the replacement pool before it waits for FIFO users. A blocking sndseqread holds f-uselock while it sleeps, so concurrent senders must be abl...