rust: uaccess: name the correct function

Correctly refer to `reserve` rather than `try_reserve` in a comment.  This
comment has been incorrect since inception in commit 1b580e7 ("rust:
uaccess: add userspace pointers").

Fixes: 1b580e7 ("rust: uaccess: add userspace pointers")
Signed-off-by: Tamir Duberstein <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
Reviewed-by: Charalampos Mitrodimas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

Author: tamird

rust/kernel/uaccess.rs

@@ -285,8 +285,7 @@ impl UserSliceReader {
         let len = self.length;
         buf.reserve(len, flags)?;
 
-        // The call to `try_reserve` was successful, so the spare capacity is at least `len` bytes
-        // long.
+        // The call to `reserve` was successful, so the spare capacity is at least `len` bytes long.
         self.read_raw(&mut buf.spare_capacity_mut()[..len])?;
 
         // SAFETY: Since the call to `read_raw` was successful, so the next `len` bytes of the