Remove two useless comparisons

according to the updated type_limits lint.

src/libsyntax/ext/format.rs

@@ -268,7 +268,7 @@ impl<'a, 'b> Context<'a, 'b> {
     fn verify_arg_type(&mut self, arg: Position, ty: ArgumentType) {
         match arg {
             Exact(arg) => {
-                if arg < 0 || self.args.len() <= arg {
+                if self.args.len() <= arg {
                     let msg = format!("invalid reference to argument `{}` (there \
                                     are {} arguments)", arg, self.args.len());
                     self.ecx.span_err(self.fmtsp, msg);

src/libterm/terminfo/parser/compiled.rs

@@ -220,9 +220,7 @@ pub fn parse(file: &mut io::Reader,
     if bools_bytes != 0 {
         for i in range(0, bools_bytes) {
             let b = try!(file.read_byte());
-            if b < 0 {
-                return Err("error: expected more bools but hit EOF".to_owned());
-            } else if b == 1 {
+            if b == 1 {
                 bools_map.insert(bnames[i as uint].to_owned(), true);
             }
         }