rust: shorten con_ids in get methods in clk module

Converts `if-else` blocks into one line code using `map_or`
for simplicity.

Signed-off-by: Onur Özkan <work@onurozkan.dev>
Link: https://lore.kernel.org/r/20250618093508.16343-1-work@onurozkan.dev
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: onur-ozkan

rust/kernel/clk.rs

@@ -132,11 +132,7 @@ mod common_clk {
         ///
         /// [`clk_get`]: https://docs.kernel.org/core-api/kernel-api.html#c.clk_get
         pub fn get(dev: &Device, name: Option<&CStr>) -> Result<Self> {
-            let con_id = if let Some(name) = name {
-                name.as_ptr()
-            } else {
-                ptr::null()
-            };
+            let con_id = name.map_or(ptr::null(), |n| n.as_ptr());
 
             // SAFETY: It is safe to call [`clk_get`] for a valid device pointer.
             //
@@ -304,11 +300,7 @@ mod common_clk {
         /// [`clk_get_optional`]:
         /// https://docs.kernel.org/core-api/kernel-api.html#c.clk_get_optional
         pub fn get(dev: &Device, name: Option<&CStr>) -> Result<Self> {
-            let con_id = if let Some(name) = name {
-                name.as_ptr()
-            } else {
-                ptr::null()
-            };
+            let con_id = name.map_or(ptr::null(), |n| n.as_ptr());
 
             // SAFETY: It is safe to call [`clk_get_optional`] for a valid device pointer.
             //