signal/riscv: Remove tsk parameter from do_trap

The do_trap function is always called with tsk == current.
Make that obvious by removing the tsk parameter.

This also makes it clear that do_trap calls force_sig_fault
on the current task.

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

arch/riscv/include/asm/bug.h

@@ -94,7 +94,7 @@ struct task_struct;
 
 extern void die(struct pt_regs *regs, const char *str);
 extern void do_trap(struct pt_regs *regs, int signo, int code,
-	unsigned long addr, struct task_struct *tsk);
+	unsigned long addr);
 
 #endif /* !__ASSEMBLY__ */