nptl: Fix SYSCALL_CANCEL for return values larger than INT_MAX (BZ 33245)

nptl: Fix SYSCALL_CANCEL for return values larger than INT_MAX (BZ 33245)

The SYSCALL_CANCEL calls __syscall_cancel, which in turn
calls __internal_syscall_cancel with an 'int' return instead of the
expected 'long int'.  This causes issues with syscalls that return
values larger than INT_MAX, such as copy_file_range [1].

Checked on x86_64-linux-gnu.

[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=79139

Reviewed-by: Andreas K. Huettel <dilfridge@gentoo.org>