sub-process: avoid leaking cmd

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

sub-process.c

@@ -63,6 +63,7 @@ void subprocess_stop(struct hashmap *hashmap, struct subprocess_entry *entry)
 	finish_command(&entry->process);
 
 	hashmap_remove(hashmap, &entry->ent, NULL);
+	FREE_AND_NULL(entry->cmd);
 }
 
 static void subprocess_exit_handler(struct child_process *process)
@@ -150,6 +151,7 @@ int subprocess_start_strvec(struct hashmap *hashmap,
 	err = start_command(process);
 	if (err) {
 		error("cannot fork to run subprocess '%s'", entry->cmd);
+		FREE_AND_NULL(entry->cmd);
 		return err;
 	}
 
@@ -158,6 +160,7 @@ int subprocess_start_strvec(struct hashmap *hashmap,
 	err = startfn(entry);
 	if (err) {
 		error("initialization for subprocess '%s' failed", entry->cmd);
+		FREE_AND_NULL(entry->cmd);
 		subprocess_stop(hashmap, entry);
 		return err;
 	}