arm: don't touch the field user_regs_struct_t::ARM_ORIG_r0

The field user_regs_struct_t::ARM_ORIG_r0 isn't used to prevent
a syscall restart on ARM unlike x86.
Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Reported-by: Chanho Park <chanho61.park@samsusng.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/arm/crtools.c

@@ -42,9 +42,6 @@ void parasite_setup_regs(unsigned long new_ip, void *stack, user_regs_struct_t *
 	if (stack)
 		regs->ARM_sp = (unsigned long)stack;
 
-	/* Avoid end of syscall processing */
-	regs->ARM_ORIG_r0 = -1;
-
 	/* Make sure flags are in known state */
 	regs->ARM_cpsr &= PSR_f | PSR_s | PSR_x | MODE32_BIT;
 }