MIPS: asm: syscall: Fix copying system call arguments

The syscall_get_arguments function expects the arguments to be copied
to the '*args' argument but instead a local variable was used to hold
the system call argument. As a result of which, this variable was
never passed to the filter and any filter testing the system call
arguments would fail. This is fixed by passing the '*args' variable
as the destination memory for the system call arguments.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6402/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/syscall.h

@@ -86,11 +86,10 @@ static inline void syscall_get_arguments(struct task_struct *task,
  unsigned int i, unsigned int n,
  unsigned long *args)
 {
- unsigned long arg;
  int ret;
 
  while (n--)
- ret |= mips_get_syscall_arg(&arg, task, regs, i++);
+ ret |= mips_get_syscall_arg(args++, task, regs, i++);
 
  /*
  * No way to communicate an error because this is a void function.