some variables were not initialize, correct a bug in expunging.

@@ -127,7 +127,7 @@ int message_save_attachment(message_t msg, const char *filename, void **data)
 	stream_t			stream;
 	header_t			hdr;
 	struct _msg_info	*info = NULL;
-	int 				ret;
+	int 				ret = 0;
 	size_t				size;
 	char 				*content_encoding;
 

@@ -159,7 +159,7 @@ int
 bio_write (bio_t bio, const char *ptr, size_t n, size_t *pnwriten)
 {
   int nleft;
-  int err;
+  int err = 0;
   size_t nwriten = 0;
   size_t total = 0;
 

@@ -121,7 +121,7 @@ _file_write (stream_t stream, const char *iptr, size_t isize,
 {
   struct _file_stream *fs = stream_get_owner (stream);
   size_t n;
-  int err;
+  int err = 0;
 
   if (fs == NULL)
     return EINVAL;

@@ -40,7 +40,7 @@ mailer_create (mailer_t *pmailer, const char *name, int id)
   mailer_entry_t entry = NULL;
   list_t list = NULL;
   iterator_t iterator;
-  int found;
+  int found = 0;
 
   (void)id;
   if (pmailer == NULL)

@@ -749,15 +749,24 @@ mbox_expunge (mailbox_t mailbox)
 	  mum = mud->umessages[j];
 	  if (mum->new_flags && ATTRIBUTE_IS_DELETED (mum->new_flags))
 	    {
-	      memmove (mud->umessages + j, mud->umessages + j + 1,
-		       (dlast - dirty) * sizeof (mum));
-	      mum->header_from = mum->header_from_end = 0;
-	      mum->header_status = mum->header_status_end = 0;
-	      mum->body = mum->body_end = 0;
-	      mum->header_lines = mum->body_lines = 0;
-	      mud->umessages[dlast] = mum;
-	      dlast--;
-	      mum = mud->umessages[j];
+	      if ((j + 1) >= mud->messages_count)
+		{
+		  /* Move all the pointers up.  So the message pointer
+		     part of mum will be at the right position.  */
+		  memmove (mud->umessages + j, mud->umessages + j + 1,
+			   (dlast - dirty) * sizeof (mum));
+		  mum->header_from = mum->header_from_end = 0;
+		  mum->header_status = mum->header_status_end = 0;
+		  mum->body = mum->body_end = 0;
+		  mum->header_lines = mum->body_lines = 0;
+		  /* We are not free()ing the useless mum, but instead
+		     we put it back in the pool, to be reuse.  */
+		  mud->umessages[dlast] = mum;
+		  dlast--;
+		  /* Set mum to the new value after the memmove so it
+		     gets cleared to.  */
+		  mum = mud->umessages[j];
+		}
 	    }
 	  mum->header_from = mum->header_from_end = 0;
 	  mum->header_status = mum->header_status_end = 0;