fix clippy lints on nightly (#2158)

Author: MaxVerevkin

src/main.rs

@@ -80,7 +80,7 @@ fn restart() -> ! {
 
     // Add "--no-init" argument if not already added
     let no_init_arg = CString::new("--no-init").unwrap();
-    if !arg.iter().any(|a| *a == no_init_arg) {
+    if !arg.contains(&no_init_arg) {
         arg.push(no_init_arg);
     }
 

src/subprocess.rs

@@ -11,10 +11,7 @@ pub fn spawn_process(cmd: &str, args: &[&str]) -> io::Result<()> {
     // Safety: libc::daemon() is async-signal-safe
     unsafe {
         proc.pre_exec(|| match libc::daemon(0, 0) {
-            -1 => Err(io::Error::new(
-                io::ErrorKind::Other,
-                "Failed to detach new process",
-            )),
+            -1 => Err(io::Error::other("Failed to detach new process")),
             _ => Ok(()),
         });
     }

src/themes/xresources.rs

@@ -11,9 +11,7 @@ use std::{env, path::PathBuf};
 
 #[cfg(not(test))]
 fn read_xresources() -> std::io::Result<String> {
-    use std::io::{Error, ErrorKind};
-    let home =
-        env::var("HOME").map_err(|_| Error::new(ErrorKind::Other, "HOME env var was not set"))?;
+    let home = env::var("HOME").map_err(|_| std::io::Error::other("HOME env var was not set"))?;
     let xresources = PathBuf::from(home + "/.Xresources");
     debug!(".Xresources @ {:?}", xresources);
     std::fs::read_to_string(xresources)