MIPS: O32 / 32-bit: Always copy 4 stack arguments.

This gets us rid of the hard to maintain table of the number of syscall
arguments and paves the way for further restructuring of the syscall
code.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/ftrace.c

@@ -383,7 +383,7 @@ unsigned long __init arch_syscall_addr(int nr)
 {
 #ifdef CONFIG_MIPS32_N32
 	if (nr >= __NR_N32_Linux && nr <= __NR_N32_Linux + __NR_N32_Linux_syscalls)
-		return (unsigned long)sysn32_call_table[(nr - __NR_N32_Linux) * 2];
+		return (unsigned long)sysn32_call_table[nr - __NR_N32_Linux];
 #endif
 	if (nr >= __NR_64_Linux  && nr <= __NR_64_Linux + __NR_64_Linux_syscalls)
 		return (unsigned long)sys_call_table[nr - __NR_64_Linux];