Fix the error handling on modern Rust

See rust-lang/rust#79965

Author: MOZGIII

efivar/src/error.rs

@@ -38,7 +38,7 @@ fn is_variable_not_found_error(err: &io::Error) -> bool {
 
 #[cfg(target_os = "windows")]
 fn is_variable_not_found_error(err: &io::Error) -> bool {
-    err.kind() == io::ErrorKind::Other && err.raw_os_error() == Some(203)
+    err.raw_os_error() == Some(203)
 }
 
 #[cfg(not(target_os = "windows"))]
@@ -49,7 +49,7 @@ fn is_buffer_too_small_error(_err: &io::Error) -> bool {
 
 #[cfg(target_os = "windows")]
 fn is_buffer_too_small_error(err: &io::Error) -> bool {
-    err.kind() == io::ErrorKind::Other && err.raw_os_error() == Some(122)
+    err.raw_os_error() == Some(122)
 }
 
 #[cfg(not(target_os = "windows"))]
@@ -59,7 +59,7 @@ fn is_permission_denied_error(err: &io::Error) -> bool {
 
 #[cfg(target_os = "windows")]
 fn is_permission_denied_error(err: &io::Error) -> bool {
-    err.kind() == io::ErrorKind::Other && err.raw_os_error() == Some(1314)
+    err.raw_os_error() == Some(1314)
 }
 
 impl Error {
@@ -75,7 +75,7 @@ impl Error {
         }
 
         if is_permission_denied_error(&error) {
-            return Error::PermissionDenied { name }
+            return Error::PermissionDenied { name };
         }
 
         Error::VarUnknownError { name, error }