Fix a few clippy warnings

coreopts.rs

@@ -18,7 +18,7 @@ impl<'a> CoreOptions<'a> {
     pub fn new(help_text: HelpText<'a>) -> Self {
         let mut ret = CoreOptions {
             options: getopts::Options::new(),
-            help_text: help_text,
+            help_text,
         };
         ret.options
             .optflag("", "help", "print usage information")

encoding.rs

@@ -66,8 +66,8 @@ impl<R: Read> Data<R> {
         Data {
             line_wrap: 76,
             ignore_garbage: false,
-            input: input,
-            format: format,
+            input,
+            format,
             alphabet: match format {
                 Base32 => b"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=",
                 Base64 => b"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789=+/",

fs.rs

@@ -31,7 +31,7 @@ macro_rules! has {
     )
 }
 
-pub fn resolve_relative_path<'a>(path: &'a Path) -> Cow<'a, Path> {
+pub fn resolve_relative_path(path: &Path) -> Cow<Path> {
     if path.components().all(|e| e != Component::ParentDir) {
         return path.into();
     }