journal: fix compiler warning in journal_file_append_data()

gcc (4.8.2, arm) does not understand that journal_file_append_field()
will always set 'fo' when it returns 0, so this warning is bogus.

Anyway, fix it by initialiting fo = NULL.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index 3a081110b9..23c4d28e73 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -1012,8 +1012,8 @@ static int journal_file_append_data(
         else
                 eq = memchr(data, '=', size);
         if (eq && eq > data) {
+                Object *fo = NULL;
                 uint64_t fp;
-                Object *fo;
 
                 /* Create field object ... */
                 r = journal_file_append_field(f, data, (uint8_t*) eq - (uint8_t*) data, &fo, &fp);