BUILD: thread: add parenthesis around values of locking macros

BUILD: thread: add parenthesis around values of locking macros

clang just failed on fd.c with this error:

  src/fd.c:491:9: error: logical not is only applied to the left hand side of this comparison [-Werror,-Wlogical-not-parentheses]
          while (HA_SPIN_TRYLOCK(OTHER_LOCK, &log_lock) != 0) {
                 ^                                      ~~
That's because this expands to this:

          while (!pl_try_s(&log_lock) != 0) {

Let's just add parenthesis in the TRYLOCK macros to avoid this.
This may need to be backported if commit df187875d ("BUG/MEDIUM: log:
don't hold the log lock during writev() on a file descriptor") is
backported as well as it seems to be the first one to trigger it.