libbpf-rs: Refine signature of Program::attach_tracepoint()

The Program::attach_tracepoint() method is generic over the category and
the tracepoint name. However, given that both arguments reference the
same type parameter, they have to be of the same source type. That's an
unnecessary restriction and almost certainly not the intention. Fix it
up by making all type parameters independent of each other.

Signed-off-by: Daniel Müller <deso@posteo.net>

Author: d-e-s-o

libbpf-rs/src/program.rs

@@ -430,7 +430,11 @@ impl Program {
 
     /// Attach this program to a [kernel
     /// tracepoint](https://www.kernel.org/doc/html/latest/trace/tracepoints.html).
-    pub fn attach_tracepoint<T: AsRef<str>>(&mut self, tp_category: T, tp_name: T) -> Result<Link> {
+    pub fn attach_tracepoint(
+        &mut self,
+        tp_category: impl AsRef<str>,
+        tp_name: impl AsRef<str>,
+    ) -> Result<Link> {
         let tp_category = util::str_to_cstring(tp_category.as_ref())?;
         let tp_category_ptr = tp_category.as_ptr();
         let tp_name = util::str_to_cstring(tp_name.as_ref())?;