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/um/kernel/ptrace.c

@@ -117,8 +117,7 @@ static void send_sigtrap(struct uml_pt_regs *regs, int error_code)
 	/* Send us the fake SIGTRAP */
 	force_sig_fault(SIGTRAP, TRAP_BRKPT,
 			/* User-mode eip? */
-			UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL,
-			current);
+			UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL);
 }
 
 /*