New error codes for IPC errors.

Made VM code debug output disappear.

kernel/system/do_vm_setbuf.c

@@ -8,6 +8,8 @@
  */
 #include "../system.h"
 
+#define VM_DEBUG 0		/* enable/ disable debug output */
+
 /*===========================================================================*
  *				do_vm_setbuf				     *
  *===========================================================================*/
@@ -18,8 +20,10 @@ message *m_ptr;			/* pointer to request message */
 	vm_size= m_ptr->m4_l2;
 	vm_mem_high= m_ptr->m4_l3;
 
+#if VM_DEBUG
 	kprintf("do_vm_setbuf: got 0x%x @ 0x%x for 0x%x\n",
 		vm_size, vm_base, vm_mem_high);
+#endif
 
 	return OK;
 }