Fixed common misspellings.

Mostly found by 'codespell'.

src/libcharon/sa/tasks/child_rekey.c

@@ -317,7 +317,7 @@ static status_t process_i(private_child_rekey_t *this, message_t *message)
 	if (message->get_payload(message, SECURITY_ASSOCIATION) == NULL)
 	{
 		/* establishing new child failed, reuse old. but not when we
-		 * recieved a delete in the meantime */
+		 * received a delete in the meantime */
 		if (!(this->collision &&
 			  this->collision->get_type(this->collision) == CHILD_DELETE))
 		{

src/libcharon/sa/tasks/ike_natd.c

@@ -353,7 +353,7 @@ static status_t build_r(private_ike_natd_t *this, message_t *message)
 	notify_payload_t *notify;
 	host_t *me, *other;
 
-	/* only add notifies on successfull responses. */
+	/* only add notifies on successful responses. */
 	if (message->get_exchange_type(message) == IKE_SA_INIT &&
 		message->get_payload(message, SECURITY_ASSOCIATION) == NULL)
 	{

src/libcharon/sa/tasks/task.h

@@ -89,7 +89,7 @@ extern enum_name_t *task_type_names;
  * A responder does the opposite; it calls process() first to handle an incoming
  * request and secondly calls build() to build an appropriate response.
  * Both methods return either SUCCESS, NEED_MORE or FAILED. A SUCCESS indicates
- * that the task completed, even when the task completed unsuccesfully. The
+ * that the task completed, even when the task completed unsuccessfully. The
  * manager then removes the task from the list. A NEED_MORE is returned when
  * the task needs further build()/process() calls to complete, the manager
  * leaves the taks in the queue. A returned FAILED indicates a critical failure.
@@ -102,7 +102,7 @@ struct task_t {
 	 *
 	 * @param message		message to add payloads to
 	 * @return
-	 *						- FAILED if a critical error occured
+	 *						- FAILED if a critical error occurred
 	 *						- DESTROY_ME if IKE_SA has been properly deleted
 	 *						- NEED_MORE if another call to build/process needed
 	 *						- SUCCESS if task completed
@@ -114,7 +114,7 @@ struct task_t {
 	 *
 	 * @param message		message to read payloads from
 	 * @return
-	 * 						- FAILED if a critical error occured
+	 * 						- FAILED if a critical error occurred
 	 *						- DESTROY_ME if IKE_SA has been properly deleted
 	 *						- NEED_MORE if another call to build/process needed
 	 *						- SUCCESS if task completed