Don't infer last element of SSL session cache twice

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/library/ssl_cache.c b/library/ssl_cache.c
index cdefa01..367edf5 100644
--- a/library/ssl_cache.c
+++ b/library/ssl_cache.c
@@ -151,14 +151,11 @@
     while( cur != NULL )
     {
         count++;
-
         if( session_id_len == cur->session_id_len &&
             memcmp( session_id, cur->session_id, cur->session_id_len ) == 0 )
         {
             goto found;
         }
-
-        last = cur;
         cur = cur->next;
     }