bug#52090: swaylock unaligned fastbin chunk detected

[Jack Hill]

Hi Guix,

swaylock sometimes crashes on core-updates-frozen 
d0f6e8ae7944666469ec1a226df502063d4d0670 with:

$ swaylock -e -c 195521 -F
malloc_consolidate(): unaligned fastbin chunk detected
Aborted

I think that this could be upstream issue #162 [0] since I see 
malloc_consolidate() in that stacktrace, and the host where I'm seeing 
this problem has some monitors that take a while to wake up from sleep.

[0] https://github.com/swaywm/swaylock/issues/162

Best,
Jack