userpref: Fix a segfault that might occour if locally stored certs could not be read

userpref_get_file_contents() was stil attempting to set the data and size
properties on the passed gnutls_datum_t even if g_file_get_contents() failed.
This shoud fix a possible segfault in any code code using the pairing.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/userpref.c b/src/userpref.c
index 6e62000..4aab67b 100644
--- a/src/userpref.c
+++ b/src/userpref.c
@@ -328,8 +328,10 @@ static int userpref_get_file_contents(const char *file, gnutls_datum_t * data)
         g_free(filepath);
 
         /* Add it to the gnutls_datnum_t structure */
-        data->data = (uint8_t*) content;
-        data->size = size;
+        if (success) {
+                data->data = (uint8_t*) content;
+                data->size = size;
+        }
 
         return success;
 }