cris: kill weird arguments of sys_{rt_,}sigreturn()

It's cheaper to call current_pt_regs() than bother fetching the damn
thing from stack.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/cris/arch-v10/kernel/signal.c

@@ -101,11 +101,9 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
 	return 1;
 }
 
-/* Define dummy arguments to be able to reach the regs argument.  */
-
-asmlinkage int sys_sigreturn(long r10, long r11, long r12, long r13, long mof,
-                             long srp, struct pt_regs *regs)
+asmlinkage int sys_sigreturn(void)
 {
+	struct pt_regs *regs = current_pt_regs();
 	struct sigframe __user *frame = (struct sigframe *)rdusp();
 	sigset_t set;
 
@@ -139,11 +137,9 @@ asmlinkage int sys_sigreturn(long r10, long r11, long r12, long r13, long mof,
 	return 0;
 }
 
-/* Define dummy arguments to be able to reach the regs argument.  */
-
-asmlinkage int sys_rt_sigreturn(long r10, long r11, long r12, long r13,
-                                long mof, long srp, struct pt_regs *regs)
+asmlinkage int sys_rt_sigreturn(void)
 {
+	struct pt_regs *regs = current_pt_regs();
 	struct rt_sigframe __user *frame = (struct rt_sigframe *)rdusp();
 	sigset_t set;
 

arch/cris/arch-v32/kernel/signal.c

@@ -82,11 +82,9 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
 	return 1;
 }
 
-/* Define some dummy arguments to be able to reach the regs argument. */
-asmlinkage int
-sys_sigreturn(long r10, long r11, long r12, long r13, long mof, long srp,
-	      struct pt_regs *regs)
+asmlinkage int sys_sigreturn(void)
 {
+	struct pt_regs *regs = current_pt_regs();
 	sigset_t set;
 	struct signal_frame __user *frame;
 	unsigned long oldspc = regs->spc;
@@ -125,11 +123,9 @@ sys_sigreturn(long r10, long r11, long r12, long r13, long mof, long srp,
 	return 0;
 }
 
-/* Define some dummy variables to be able to reach the regs argument. */
-asmlinkage int
-sys_rt_sigreturn(long r10, long r11, long r12, long r13, long mof, long srp,
-		 struct pt_regs *regs)
+asmlinkage int sys_rt_sigreturn(void)
 {
+	struct pt_regs *regs = current_pt_regs();
 	sigset_t set;
 	struct rt_signal_frame __user *frame;
 	unsigned long oldspc = regs->spc;