[PATCH] Get rid of Werror=maybe-uninitialized in clock_nanosleep.c.

[Stefan Liebler]

Hi,

If build with -O3 on s390 (31bit) on kernels < 5.1, there are the 
following werrors:
../sysdeps/unix/sysv/linux/clock_nanosleep.c:91:12: error: ‘*((void 
*)&trem64+12)’ may be used uninitialized in this function 
[-Werror=maybe-uninitialized]
*rem = valid_timespec64_to_timespec (trem64);

../include/time.h:264:15: error: ‘trem64’ may be used uninitialized in 
this function [-Werror=maybe-uninitialized]
ts.tv_sec = (time_t) ts64.tv_sec;

This patch moves the calculation of r before the if condition.  Then GCC
recognizes that the condition here and in __clock_nanosleep equals and that
trem64 in __clock_nanosleep is initialized.

Bye
Stefan
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