Helper function returns pointer in esi instead of eax

drivers/virtio/device_table.inc

@@ -12,9 +12,7 @@ VEN_STRIDE       = 8
 ; Returns pointer to the device id stored in data
 if used PCI_find_dev
 proc PCI_find_dev stdcall ven_id, dev_id
-    xor     eax, eax
-
-    push    esi
+    xor    esi, esi
 
     mov     esi, ven1_array
     cmp     [ven_id], VirtVendorID1
@@ -33,24 +31,22 @@ proc PCI_find_dev stdcall ven_id, dev_id
     test    edx, edx
     jz      .not_found      ;end of array
 
-    mov     eax, esi
-    add     esi, VEN_STRIDE
-
     cmp     edx, [dev_id]
-    jnz     .loop
+    jz     .found
 
-;found device
+    add     esi, VEN_STRIDE
+    jmp     .loop
+
+.found:
 
     pop     edx
-    pop     esi
     ret
 
 .not_found:
 
-    xor     eax, eax
     pop     edx
 @@:
-    pop     esi
+    xor     esi, esi
     ret
 endp
 end if

drivers/virtio/virt_io_det.asm

@@ -65,17 +65,14 @@ proc detect
         movzx   ecx, cx    
         movzx   edx, dx     
 
-        push    eax
-
         stdcall PCI_find_dev, edx, ecx
-        test    eax, eax
+        test    esi, esi
         jz     .notVirt
 
-        add     eax, 4
-        DEBUGF  1, "I: %s %x:%x -> %s\n", esi, dx, cx, [eax]
+        add     esi, 4
+        DEBUGF  1, "I: VirtIO Driver %x:%x -> %s\n", dx, cx, [esi]
 
 .notVirt:
-        pop     eax
         jmp     .next_dev
 
 .finish: