posix-cpu-timers: fix clock_gettime with CLOCK_PROCESS_CPUTIME_ID

Since CLOCK_PROCESS_CPUTIME_ID is in fact translated to -6, the switch
statement in cpu_clock_sample_group() must first mask off the irrelevant
bits, similar to cpu_clock_sample().

Signed-off-by: Petr Tesarik <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>

--
posix-cpu-timers.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

kernel/posix-cpu-timers.c

···
 	struct task_cputime cputime;
 
 	thread_group_cputime(p, &cputime);
-	switch (which_clock) {
+	switch (CPUCLOCK_WHICH(which_clock)) {
 	default:
 		return -EINVAL;
 	case CPUCLOCK_PROF: