Minor fixes.

* libmailutils/mime/mimehdr.c (free_param_continuation): Change
return type to void.
* mu/shell.c: Include muaux.h
* libproto/imap/logout.c (mu_imap_logout): Logout is valid in any
state, except MU_IMAP_SESSION_INIT.

@@ -134,7 +134,7 @@ struct param_continuation
   const char *param_cset;
 };
 
-static int
+static void
 free_param_continuation (struct param_continuation *p)
 {
   free (p->param_name);

@@ -32,8 +32,7 @@ mu_imap_logout (mu_imap_t imap)
     return EINVAL;
   if (!imap->io)
     return MU_ERR_NO_TRANSPORT;
-  if (!(imap->session_state == MU_IMAP_SESSION_AUTH ||
-	imap->session_state == MU_IMAP_SESSION_SELECTED))
+  if (imap->session_state == MU_IMAP_SESSION_INIT)
     return MU_ERR_SEQ;
 
   switch (imap->client_state)

@@ -23,6 +23,7 @@
 #include <mailutils/mailutils.h>
 #include <mailutils/tls.h>
 #include "mailutils/libargp.h"
+#include "muaux.h"
 #include "mu.h"
 #include "xalloc.h"