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ee5c971d77
Build fails on 32-bit Slackware because GCC 11's `-Werror=sign-compare`
is stricter than necessary:
cc -Wall -Wextra -Werror -O3 -I../include -D_FILE_OFFSET_BITS=64 -std=c99 -O2 -march=i586 -mtune=i686 -o bees-version.o -c bees-version.c
bees.cc: In function 'void bees_fsync(int)':
bees.cc:426:24: error: comparison of integer expressions of different signedness: '__fsword_t' {aka 'int'} and 'unsigned int' [-Werror=sign-compare]
426 | if (stf.f_type != BTRFS_SUPER_MAGIC) {
| ^
To work around this, cast `stf.f_type` to the same type as
`BTRFS_SUPER_MAGIC`, so it has the same number of bits that we're looking
for in the magic value.
Fixes: https://github.com/Zygo/bees/issues/317
Signed-off-by: Zygo Blaxell <bees@furryterror.org>