ZP-843 Fixed warnings that $stream was boolean instead of ressource.

Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/kopano/mapiprovider.php

@@ -2458,10 +2458,11 @@ class MAPIProvider {
         if (function_exists("mapi_inetmapi_imtoinet")) {
             $addrbook = $this->getAddressbook();
             $stream = mapi_inetmapi_imtoinet($this->session, $addrbook, $mapimessage, array('use_tnef' => -1));
+
+            if (isset($stream)) {
                 $mstreamstat = mapi_stream_stat($stream);
                 $streamsize = $mstreamstat["cb"];
-
-            if (isset($stream) && isset($streamsize)) {
+                if (isset($streamsize)) {
                     if (Request::GetProtocolVersion() >= 12.0) {
                         if (!isset($message->asbody))
                             $message->asbody = new SyncBaseBody();
@@ -2477,9 +2478,8 @@ class MAPIProvider {
                     unset($message->body, $message->bodytruncated);
                     return true;
                 }
-            else {
-                ZLog::Write(LOGLEVEL_ERROR, sprintf("MAPIProvider->imtoinet(): got no stream or content from mapi_inetmapi_imtoinet()"));
             }
+            ZLog::Write(LOGLEVEL_ERROR, sprintf("MAPIProvider->imtoinet(): got no stream or content from mapi_inetmapi_imtoinet()"));
         }
 
         return false;