[MIPS] Use find_task_by_vpid in system calls

There are some places left in mips, that lookup task in initial namespace,
while the code doing so gets the pid from the user space and thus must
treat it as virtual.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/mips-mt-fpaff.c

@@ -36,7 +36,7 @@ unsigned long mt_fpemul_threshold = 0;
  */
 static inline struct task_struct *find_process_by_pid(pid_t pid)
 {
-	return pid ? find_task_by_pid(pid) : current;
+	return pid ? find_task_by_vpid(pid) : current;
 }
 
 

arch/mips/kernel/sysirix.c

@@ -111,7 +111,7 @@ asmlinkage int irix_prctl(unsigned option, ...)
 		printk("irix_prctl[%s:%d]: Wants PR_ISBLOCKED\n",
 		       current->comm, current->pid);
 		read_lock(&tasklist_lock);
-		task = find_task_by_pid(va_arg(args, pid_t));
+		task = find_task_by_vpid(va_arg(args, pid_t));
 		error = -ESRCH;
 		if (error)
 			error = (task->run_list.next != NULL);