journal: when iterating through a file we might lose messages when changing direction.

https://bugs.freedesktop.org/show_bug.cgi?id=63672

TODO

@@ -32,6 +32,8 @@ Fedora 19:
 
 Features:
 
+* truncate whitespace of var names the same way as values in parse_env_file_internal()
+
 * dbus: when a unit failed to load (i.e. is in UNIT_ERROR state), we
   should be able to safely try another attempt when the bus call LoadUnit() is invoked.
 

src/journal/sd-journal.c

@@ -109,6 +109,9 @@ static void set_location(sd_journal *j, LocationType type, JournalFile *f, Objec
 
         init_location(&j->current_location, type, f, o);
 
+        if (j->current_file)
+                j->current_file->current_offset = 0;
+
         j->current_file = f;
         j->current_field = 0;