removed trailing whitespace

Author: battisti

src/libtest/lib.rs

@@ -439,7 +439,7 @@ pub fn parse_opts(args: &[String]) -> Option<OptRes> {
     let test_threads = match matches.opt_str("test-threads") {
         Some(n_str) =>
             match n_str.parse::<usize>() {
-                Ok(0) => 
+                Ok(0) =>
                     return Some(Err(format!("argument for --test-threads must not be 0"))),
                 Ok(n) => Some(n),
                 Err(e) =>