sys_getpgid: fixed the syscall prototype since it actually has one argument.

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/x86/syscall-x86-64.def

@@ -50,7 +50,7 @@ __NR_readlink		89		sys_readlink		(const char *path, char *buf, int bufsize)
 __NR_getgroups		115		sys_getgroups		(int gsize, unsigned int *groups)
 __NR_setresuid		117		sys_setresuid		(int uid, int euid, int suid)
 __NR_setresgid		119		sys_setresgid		(int gid, int egid, int sgid)
-__NR_getpgid		121		sys_getpgid		(void)
+__NR_getpgid		121		sys_getpgid		(pid_t pid)
 __NR_setfsuid		122		sys_setfsuid		(int fsuid)
 __NR_setfsgid		123		sys_setfsgid		(int fsgid)
 __NR_getsid		124		sys_getsid		(void)

pie/parasite.c

@@ -286,7 +286,7 @@ static int dump_misc(struct parasite_dump_misc *args)
 
 	args->pid = sys_getpid();
 	args->sid = sys_getsid();
-	args->pgid = sys_getpgid();
+	args->pgid = sys_getpgid(0);
 
 	return 0;
 }