[KERNEL] Adjust packet size calculation

git-svn-id: svn://kolibrios.org@9729 a494cfbc-eb01-0410-851d-a64ba20cac60

kernel/trunk/network/IPv4.inc

@@ -490,8 +490,8 @@ ipv4_input:
 
         push    eax
         mov     ax, [edx + IPv4_header.FlagsAndFragmentOffset]
-        xchg    al, ah
         shl     ax, 3
+        xchg    al, ah
         add     cx, ax
         pop     eax
         DEBUGF  DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Fragment size=%u\n", ecx
@@ -1158,4 +1158,4 @@ ipv4_api:
 
         call    net_send_event
         xor     eax, eax
-        ret
+        ret