imap4d: bugfix

* NEWS: Version 2.99.91
* configure.ac: Likewise.
* imap4d/imap4d.h (io_getline): Change return value
* imap4d/io.c (io_getline): Abort if a read error occurs.

-GNU mailutils NEWS -- history of user-visible changes. 2011-03-30
+GNU mailutils NEWS -- history of user-visible changes. 2011-06-08
 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
 Free Software Foundation, Inc.
 See the end of file for copying conditions.
@@ -6,7 +6,7 @@ See the end of file for copying conditions.
 Please send mailutils bug reports to <bug-mailutils@gnu.org>.
 
 
-Version 2.99.90 (Git)
+Version 2.99.91 (Git)
 
 This version is highly experimental.  It features a rewrite from
 scratch of the stream subsystem and other vital parts of the

@@ -17,7 +17,7 @@ dnl You should have received a copy of the GNU General Public License along
 dnl with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ(2.63)
-AC_INIT([GNU Mailutils], [2.99.90], [bug-mailutils@gnu.org], [mailutils])
+AC_INIT([GNU Mailutils], [2.99.91], [bug-mailutils@gnu.org], [mailutils])
 AC_CONFIG_SRCDIR([libmailutils/mailbox/mailbox.c])
 AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE([gnits 1.11 dist-bzip2 dist-xz std-options silent-rules])

@@ -219,7 +219,7 @@ extern int io_stream_completion_response (mu_stream_t str,
 					  int rc, 
 					  const char *format, ...)
                                     MU_PRINTFLIKE(4,5);
-int io_getline (char **pbuf, size_t *psize, size_t *pnbytes);
+void io_getline (char **pbuf, size_t *psize, size_t *pnbytes);
 void io_setio (int, int);
 void io_flush (void);
 int io_wait_input (int);

@@ -305,7 +305,7 @@ util_is_master ()
   return iostream == NULL;
 }
 
-int
+void
 io_getline (char **pbuf, size_t *psize, size_t *pnbytes)
 {
   size_t len;
@@ -323,7 +323,11 @@ io_getline (char **pbuf, size_t *psize, size_t *pnbytes)
       if (pnbytes)
 	*pnbytes = len;
     }
-  return rc;
+  else
+    {
+      mu_error (_("read error: %s"), mu_strerror (rc));
+      imap4d_bye (ERR_NO_IFILE);
+    }
 }