[evolution-data-server] Return the correct type in a few places

[Kjartan Maraas <kmaraas src gnome org>]

commit f8d2fd95720b8c58f7d8587bc60f07b8f2bd75b8
Author: Kjartan Maraas <kmaraas gnome org>
Date:   Fri Sep 25 21:56:05 2009 +0200

    Return the correct type in a few places

 addressbook/backends/google/google-book.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/addressbook/backends/google/google-book.c b/addressbook/backends/google/google-book.c
index 566de42..405343f 100644
--- a/addressbook/backends/google/google-book.c
+++ b/addressbook/backends/google/google-book.c
@@ -1097,7 +1097,7 @@ google_book_get_contact (GoogleBook *book,
     priv = GET_PRIVATE (book);
 
     __debug__ (G_STRFUNC);
-    g_return_val_if_fail (IS_GOOGLE_BOOK (book), FALSE);
+    g_return_val_if_fail (IS_GOOGLE_BOOK (book), NULL);
 
     google_book_cache_refresh_if_needed (book, error);
 
@@ -1130,7 +1130,7 @@ google_book_get_all_contacts (GoogleBook *book,
     priv = GET_PRIVATE (book);
 
     __debug__ (G_STRFUNC);
-    g_return_val_if_fail (IS_GOOGLE_BOOK (book), FALSE);
+    g_return_val_if_fail (IS_GOOGLE_BOOK (book), NULL);
 
     google_book_cache_refresh_if_needed (book, error);
 
@@ -1171,7 +1171,7 @@ google_book_get_all_contacts_in_live_mode (GoogleBook *book)
     priv = GET_PRIVATE (book);
 
     __debug__ (G_STRFUNC);
-    g_return_val_if_fail (IS_GOOGLE_BOOK (book), FALSE);
+    g_return_val_if_fail (IS_GOOGLE_BOOK (book), NULL);
 
     priv->live_mode = TRUE;