syscalls: Fix file comments for syscalls implemented in kernel/sys.c

The relevant syscalls were previously moved from kernel/timer.c to kernel/sys.c,
but the comments weren't updated to reflect this change.

Fixing these comments messes up the alphabetical ordering of syscalls by
filename. This could be fixed by merging the two groups of kernel/sys.c syscalls,
but that would require reordering the syscalls and renumbering them to maintain
the numerical order in unistd.h.
Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Link: https://lore.kernel.org/r/20201112215657.GA4539@charmander'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

include/linux/syscalls.h

@@ -744,7 +744,7 @@ asmlinkage long sys_settimeofday(struct __kernel_old_timeval __user *tv,
 asmlinkage long sys_adjtimex(struct __kernel_timex __user *txc_p);
 asmlinkage long sys_adjtimex_time32(struct old_timex32 __user *txc_p);
 
-/* kernel/timer.c */
+/* kernel/sys.c */
 asmlinkage long sys_getpid(void);
 asmlinkage long sys_getppid(void);
 asmlinkage long sys_getuid(void);

include/uapi/asm-generic/unistd.h

@@ -517,7 +517,7 @@ __SC_COMP(__NR_settimeofday, sys_settimeofday, compat_sys_settimeofday)
 __SC_3264(__NR_adjtimex, sys_adjtimex_time32, sys_adjtimex)
 #endif
 
-/* kernel/timer.c */
+/* kernel/sys.c */
 #define __NR_getpid 172
 __SYSCALL(__NR_getpid, sys_getpid)
 #define __NR_getppid 173