include/linux/syscalls.h: use pid_t instead of int

In include/linux/syscalls.h, the four functions sys_kill, sys_tgkill,
sys_tkill and sys_rt_sigqueueinfo are declared with "int pid" and "int
tgid".

However, in kernel/signal.c, the corresponding definitions use the more
appropriate "pid_t" (which is a typedef'd int).

This patch changes "int" to "pid_t" in the declarations of sys_kill,
sys_tgkill, sys_tkill and sys_rt_sigqueueinfo in <linux/syscalls.h> in
order to harmonize the function declarations with their respective
definitions.

Link: http://lkml.kernel.org/r/57302FDA.7020205@renenyffenegger.ch
Signed-off-by: René Nyffenegger <mail@renenyffenegger.ch>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
Cc: Zach Brown <zab@redhat.com>
Cc: Milosz Tanski <milosz@adfin.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/syscalls.h

@@ -371,10 +371,10 @@ asmlinkage long sys_rt_sigtimedwait(const sigset_t __user *uthese,
 				size_t sigsetsize);
 asmlinkage long sys_rt_tgsigqueueinfo(pid_t tgid, pid_t  pid, int sig,
 		siginfo_t __user *uinfo);
-asmlinkage long sys_kill(int pid, int sig);
-asmlinkage long sys_tgkill(int tgid, int pid, int sig);
-asmlinkage long sys_tkill(int pid, int sig);
-asmlinkage long sys_rt_sigqueueinfo(int pid, int sig, siginfo_t __user *uinfo);
+asmlinkage long sys_kill(pid_t pid, int sig);
+asmlinkage long sys_tgkill(pid_t tgid, pid_t pid, int sig);
+asmlinkage long sys_tkill(pid_t pid, int sig);
+asmlinkage long sys_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t __user *uinfo);
 asmlinkage long sys_sgetmask(void);
 asmlinkage long sys_ssetmask(int newmask);
 asmlinkage long sys_signal(int sig, __sighandler_t handler);