[evolution-data-server] I#189 - Crash on malformed server response with minimal capabilities

[Milan Crha <mcrha src gnome org>]

commit 2cc39592b532cf0dc994fd3694b8e6bf924c9ab5
Author: Milan Crha <mcrha redhat com>
Date:   Mon Feb 10 10:00:32 2020 +0100

    I#189 - Crash on malformed server response with minimal capabilities
    
    Closes https://gitlab.gnome.org/GNOME/evolution-data-server/issues/189

 src/camel/providers/imapx/camel-imapx-server.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/camel/providers/imapx/camel-imapx-server.c b/src/camel/providers/imapx/camel-imapx-server.c
index 3c38fb1e9..3883321ec 100644
--- a/src/camel/providers/imapx/camel-imapx-server.c
+++ b/src/camel/providers/imapx/camel-imapx-server.c
@@ -3045,7 +3045,8 @@ connected:
 
                        /* See if we got new capabilities
                         * in the STARTTLS response. */
-                       imapx_free_capability (is->priv->cinfo);
+                       if (is->priv->cinfo)
+                               imapx_free_capability (is->priv->cinfo);
                        is->priv->cinfo = NULL;
                        if (ic->status->condition == IMAPX_CAPABILITY) {
                                is->priv->cinfo = ic->status->u.cinfo;