[balsa/52-fix-clang-9-fails] imap-handle: Do not confuse Imap* enums

[Peter Bloomfield <peterb src gnome org>]

commit eaa8b28a95cb004d061be2d9e3b3f0036ffe3bfb
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Mon Jan 11 17:58:23 2021 -0500

    imap-handle: Do not confuse Imap* enums
    
    Do not confuse ImapResult and ImapResponse enums. Possible fix for 
https://gitlab.gnome.org/GNOME/balsa/-/issues/51

 libbalsa/imap/imap-handle.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/libbalsa/imap/imap-handle.c b/libbalsa/imap/imap-handle.c
index 5f112f090..eb045d9a7 100644
--- a/libbalsa/imap/imap-handle.c
+++ b/libbalsa/imap/imap-handle.c
@@ -649,6 +649,7 @@ imap_timeout_cb(void *arg)
 static ImapResult
 imap_mbox_connect(ImapMboxHandle* handle)
 {
+  ImapResult retval;
   ImapResponse resp;
   GError *error = NULL;
 
@@ -697,20 +698,20 @@ imap_mbox_connect(ImapMboxHandle* handle)
     (strncmp(handle->last_msg, "Microsoft Exchange", 18) != 0);
   if((handle->tls_mode == NET_CLIENT_CRYPT_ENCRYPTED) ||
         (handle->tls_mode == NET_CLIENT_CRYPT_NONE)) {
-    resp = IMAP_SUCCESS; /* secured already with SSL, or no encryption requested */
+    retval = IMAP_SUCCESS; /* secured already with SSL, or no encryption requested */
   } else if(imap_mbox_handle_can_do(handle, IMCAP_STARTTLS)) {
     if( imap_handle_starttls(handle, &error) != IMR_OK) {
       imap_mbox_handle_set_msg(handle, _("TLS negotiation failed: %s"), error_safe(error));
-      resp = IMAP_UNSECURE; /* TLS negotiation error */
+      retval = IMAP_UNSECURE; /* TLS negotiation error */
     } else {
-      resp = IMAP_SUCCESS; /* secured with TLS */
+      retval = IMAP_SUCCESS; /* secured with TLS */
     }
   } else {
        imap_mbox_handle_set_msg(handle, _("TLS required but not available"));
-    resp = IMR_NO; /* TLS unavailable */
+    retval = IMAP_AUTH_UNAVAIL; /* TLS unavailable */
   }
 
-  return resp;
+  return retval;
 }
 
 unsigned