Fix reading of last page in ogg stream

When trying to read a packet from the last page the readPages() method
would return false for all packets on the last page.

Move the lastPage check just before trying to create the next page, and
after the packetIndex check of the last fetched page.

Author: StefanBruens

taglib/ogg/oggfile.cpp

@@ -191,12 +191,15 @@ bool Ogg::File::readPages(unsigned int i)
       const Page *page = d->pages.back();
       packetIndex = nextPacketIndex(page);
       offset = page->fileOffset() + page->size();
-    }
-
-    // Enough pages have been fetched.
 
-    if(packetIndex > i)
-      return true;
+      // Enough pages have been fetched.
+      if(packetIndex > i) {
+        return true;
+      }
+      else if(page->header()->lastPageOfStream()) {
+        return false;
+      }
+    }
 
     // Read the next page and add it to the page list.
 
@@ -208,9 +211,6 @@ bool Ogg::File::readPages(unsigned int i)
 
     nextPage->setFirstPacketIndex(packetIndex);
     d->pages.append(nextPage);
-
-    if(nextPage->header()->lastPageOfStream())
-      return false;
   }
 }