rust: clk: use CStr::as_char_ptr

Replace the use of `as_ptr` which works through `<CStr as
Deref<Target=&[u8]>::deref()` in preparation for replacing
`kernel::str::CStr` with `core::ffi::CStr` as the latter does not
implement `Deref<Target=&[u8]>`.

Signed-off-by: Tamir Duberstein <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

Author: tamird

rust/kernel/clk.rs

@@ -136,7 +136,7 @@ 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 = name.map_or(ptr::null(), |n| n.as_ptr());
+            let con_id = name.map_or(ptr::null(), |n| n.as_char_ptr());
 
             // SAFETY: It is safe to call [`clk_get`] for a valid device pointer.
             //
@@ -304,7 +304,7 @@ 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 = name.map_or(ptr::null(), |n| n.as_ptr());
+            let con_id = name.map_or(ptr::null(), |n| n.as_char_ptr());
 
             // SAFETY: It is safe to call [`clk_get_optional`] for a valid device pointer.
             //