clippy: fix warnings from manual_let_else lint

Author: cakebaker

src/uu/mktemp/src/mktemp.rs

@@ -198,20 +198,17 @@ impl Params {
         // Get the start and end indices of the randomized part of the template.
         //
         // For example, if the template is "abcXXXXyz", then `i` is 3 and `j` is 7.
-        let (i, j) = match find_last_contiguous_block_of_xs(&options.template) {
-            None => {
-                let s = match options.suffix {
-                    // If a suffix is specified, the error message includes the template without the suffix.
-                    Some(_) => options
-                        .template
-                        .chars()
-                        .take(options.template.len())
-                        .collect::<String>(),
-                    None => options.template,
-                };
-                return Err(MkTempError::TooFewXs(s));
-            }
-            Some(indices) => indices,
+        let Some((i, j)) = find_last_contiguous_block_of_xs(&options.template) else {
+            let s = match options.suffix {
+                // If a suffix is specified, the error message includes the template without the suffix.
+                Some(_) => options
+                    .template
+                    .chars()
+                    .take(options.template.len())
+                    .collect::<String>(),
+                None => options.template,
+            };
+            return Err(MkTempError::TooFewXs(s));
         };
 
         // Combine the directory given as an option and the prefix of the template.

src/uu/nohup/src/nohup.rs

@@ -143,9 +143,8 @@ fn find_stdout() -> UResult<File> {
             Ok(t)
         }
         Err(e1) => {
-            let home = match env::var("HOME") {
-                Err(_) => return Err(NohupError::OpenFailed(internal_failure_code, e1).into()),
-                Ok(h) => h,
+            let Ok(home) = env::var("HOME") else {
+                return Err(NohupError::OpenFailed(internal_failure_code, e1).into());
             };
             let mut homeout = PathBuf::from(home);
             homeout.push(NOHUP_OUT);