fixed build error

src/kernel/arch_i386/interrupts.c

@@ -21,7 +21,7 @@ cpu_registers_t *(*interrupt_handlers[16])(cpu_registers_t *regs) = {0};
 
 void _irq_handler(cpu_registers_t *regs){
     if(regs->int_no == 0x80){
-        syscall(regs);
+        regs = syscall(regs);
     }
     else if(interrupt_handlers[regs->int_no - 32])
     {

src/kernel/shared/interrupts.h

@@ -21,6 +21,8 @@ typedef struct idt{
 #define IDT_DPL_KERNEL  0 << 5
 #define IDT_DPL_USER    3 << 5
 
+cpu_registers_t *syscall(cpu_registers_t * regs);
+
 inline void enable_interrupts(){
     asm volatile("sti");
 }