Using bool values produces sparse warnings of this form:

fs/xfs/./xfs_trace.h:2252:1: warning: odd constant _Bool cast (ffffffffffffffff becomes 1)
fs/xfs/./xfs_trace.h:2252:1: warning: odd constant _Bool cast (ffffffffffffffff becomes 1)
fs/xfs/./xfs_trace.h:2278:1: warning: odd constant _Bool cast (ffffffffffffffff becomes 1)
fs/xfs/./xfs_trace.h:2278:1: warning: odd constant _Bool cast (ffffffffffffffff becomes 1)
fs/xfs/./xfs_trace.h:2307:1: warning: odd constant _Bool cast (ffffffffffffffff becomes 1)

Just use a char instead to fix those up.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>