Add missing break

In ''int execute_tests( int argc , const char ** argv )'' function,
switch case is missing break statement.

Signed-off-by: Tuvshinzaya Erdenekhuu <tuvshinzaya.erdenekhuu@arm.com>

tests/suites/host_test.function

@@ -590,6 +590,7 @@ int execute_tests( int argc , const char ** argv )
              */
             test_files = &argv[ arg_index ];
             testfile_count = argc - arg_index;
+            break;
         }
 
         arg_index++;