[PATCH] rust: opp: use to_result for error handling

["Onur Özkan" <work@onurozkan.dev>]

Simplifies error handling by replacing the manual check
of the return value with the `to_result` helper.

Signed-off-by: Onur Özkan <work@onurozkan.dev>
---
 rust/kernel/opp.rs | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/rust/kernel/opp.rs b/rust/kernel/opp.rs
index 08126035d2c6..9d79c2816af5 100644
--- a/rust/kernel/opp.rs
+++ b/rust/kernel/opp.rs
@@ -12,7 +12,7 @@
     clk::Hertz,
     cpumask::{Cpumask, CpumaskVar},
     device::Device,
-    error::{code::*, from_err_ptr, from_result, to_result, Error, Result, VTABLE_DEFAULT_ERROR},
+    error::{code::*, from_err_ptr, from_result, to_result, Result, VTABLE_DEFAULT_ERROR},
     ffi::c_ulong,
     prelude::*,
     str::CString,
@@ -500,11 +500,8 @@ pub fn set(self, dev: &Device) -> Result<ConfigToken> {
         // requirements. The OPP core guarantees not to access fields of [`Config`] after this call
         // and so we don't need to save a copy of them for future use.
         let ret = unsafe { bindings::dev_pm_opp_set_config(dev.as_raw(), &mut config) };
-        if ret < 0 {
-            Err(Error::from_errno(ret))
-        } else {
-            Ok(ConfigToken(ret))
-        }
+
+        to_result(ret).map(|()| ConfigToken(ret))
     }

     /// Config's clk callback.
@@ -713,11 +710,8 @@ pub fn opp_count(&self) -> Result<u32> {
         // SAFETY: The requirements are satisfied by the existence of [`Device`] and its safety
         // requirements.
         let ret = unsafe { bindings::dev_pm_opp_get_opp_count(self.dev.as_raw()) };
-        if ret < 0 {
-            Err(Error::from_errno(ret))
-        } else {
-            Ok(ret as u32)
-        }
+
+        to_result(ret).map(|()| ret as u32)
     }

     /// Returns max clock latency (in nanoseconds) of the [`OPP`]s in the [`Table`].
--
2.50.0