Bug 825992 - Safeguard against null closing AboutHome with a null top sites adapter. r=mfinkle

mobile/android/base/AboutHomeContent.java

@@ -254,10 +254,11 @@ public class AboutHomeContent extends ScrollView
             mAccountListener = null;
         }
 
-        Cursor cursor = mTopSitesAdapter.getCursor();
-        if (cursor != null && !cursor.isClosed())
-            cursor.close();
-
+        if (mTopSitesAdapter != null) {
+            Cursor cursor = mTopSitesAdapter.getCursor();
+            if (cursor != null && !cursor.isClosed())
+                cursor.close();
+        }
     }
 
     void setLastTabsVisibility(boolean visible) {

mobile/android/base/db/BrowserDB.java

@@ -315,6 +315,7 @@ public class BrowserDB {
                     String title = c.getString(c.getColumnIndex(URLColumns.TITLE));
                     mPinnedSites.put(pos, new PinnedSite(title, url));
                 } while (c.moveToNext());
+                c.close();
             }
         }