rust: error: Rename to_kernel_errno() -> to_errno()

This is kernel code, so specifying "kernel" is redundant. Let's simplify
things and just call it to_errno().

Reviewed-by: Gary Guo <[email protected]>
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Signed-off-by: Asahi Lina <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

Author: asahilina

rust/kernel/error.rs

@@ -73,7 +73,7 @@ pub struct Error(core::ffi::c_int);
 
 impl Error {
     /// Returns the kernel error code.
-    pub fn to_kernel_errno(self) -> core::ffi::c_int {
+    pub fn to_errno(self) -> core::ffi::c_int {
         self.0
     }
 }

rust/macros/module.rs

@@ -278,7 +278,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
                         return 0;
                     }}
                     Err(e) => {{
-                        return e.to_kernel_errno();
+                        return e.to_errno();
                     }}
                 }}
             }}