Fixed common misspellings.

Mostly found by 'codespell'.

src/libtls/tls_alert.h

@@ -98,7 +98,7 @@ struct tls_alert_t {
 	/**
 	 * Did a fatal alert occur?.
 	 *
-	 * @return				TRUE if a fatal alert has occured
+	 * @return				TRUE if a fatal alert has occurred
 	 */
 	bool (*fatal)(tls_alert_t *this);
 

src/libtls/tls_crypto.c

@@ -603,7 +603,7 @@ static suite_algs_t suite_algs[] = {
 };
 
 /**
- * Look up algoritms by a suite
+ * Look up algorithms by a suite
  */
 static suite_algs_t *find_suite(tls_cipher_suite_t suite)
 {

src/libtls/tls_fragmentation.c

@@ -242,7 +242,7 @@ METHOD(tls_fragmentation_t, process, status_t,
 	{
 		case ALERT_SENDING:
 		case ALERT_SENT:
-			/* don't accept more input, fatal error ocurred */
+			/* don't accept more input, fatal error occurred */
 			return NEED_MORE;
 		case ALERT_NONE:
 			break;

src/libtls/tls_protection.c

@@ -112,7 +112,7 @@ METHOD(tls_protection_t, process, status_t,
 	private_tls_protection_t *this, tls_content_type_t type, chunk_t data)
 {
 	if (this->alert->fatal(this->alert))
-	{	/* don't accept more input, fatal error ocurred */
+	{	/* don't accept more input, fatal error occurred */
 		return NEED_MORE;
 	}