Changing session error logging verbiage to be a little less unsettling.

Signed-off-by: Pascal Kriete <pascal@pascalkriete.com>
diff --git a/system/libraries/Session/drivers/Session_cookie.php b/system/libraries/Session/drivers/Session_cookie.php
index b44c833..51d94da 100755
--- a/system/libraries/Session/drivers/Session_cookie.php
+++ b/system/libraries/Session/drivers/Session_cookie.php
@@ -386,7 +386,7 @@
 
 		if ($hmac !== hash_hmac('sha1', $session, $this->encryption_key))
 		{
-			log_message('error', 'The session cookie data did not match what was expected. This could be a possible hacking attempt.');
+			log_message('error', 'The session cookie data did not match what was expected.');
 			$this->sess_destroy();
 			return FALSE;
 		}