rust: jump_label: add __rust_helper to helpers

This is needed to inline these helpers into Rust code.

Reviewed-by: Boqun Feng <[email protected]>
Reviewed-by: Gary Guo <[email protected]>
Signed-off-by: Alice Ryhl <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

rust/helpers/jump_label.c

@@ -7,7 +7,7 @@
 #include <linux/jump_label.h>
 
 #ifndef CONFIG_JUMP_LABEL
-int rust_helper_static_key_count(struct static_key *key)
+__rust_helper int rust_helper_static_key_count(struct static_key *key)
 {
 	return static_key_count(key);
 }