signal: Remove the task parameter from force_sig_fault

As synchronous exceptions really only make sense against the current
task (otherwise how are you synchronous) remove the task parameter
from from force_sig_fault to make it explicit that is what is going
on.

The two known exceptions that deliver a synchronous exception to a
stopped ptraced task have already been changed to
force_sig_fault_to_task.

The callers have been changed with the following emacs regular expression
(with obvious variations on the architectures that take more arguments)
to avoid typos:

force_sig_fault[(]\([^,]+\)[,]\([^,]+\)[,]\([^,]+\)[,]\W+current[)]
->
force_sig_fault(\1,\2,\3)

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

arch/sh/mm/fault.c

@@ -41,7 +41,7 @@ static inline int notify_page_fault(struct pt_regs *regs, int trap)
 static void
 force_sig_info_fault(int si_signo, int si_code, unsigned long address)
 {
-	force_sig_fault(si_signo, si_code, (void __user *)address, current);
+	force_sig_fault(si_signo, si_code, (void __user *)address);
 }
 
 /*