profile.py: Remove unused kernel_ret_ip

With 7157e6ec, `DO_KERNEL_RIP` was removed. That was the only user of the `kernel_ret_ip` field. I believe we can now remove that field.

diff --git a/tools/profile.py b/tools/profile.py
index 093d07c5f245a38e8b639b5e5fb4d1efe892db4f..47d2adf297fe9a7354ca5e1c73c83b2b44eeea8c 100755 (executable)
--- a/tools/profile.py
+++ b/tools/profile.py
@@ -142,7 +142,6 @@ bpf_text = """
 struct key_t {
     u32 pid;
     u64 kernel_ip;
-    u64 kernel_ret_ip;
     int user_stack_id;
     int kernel_stack_id;
     char name[TASK_COMM_LEN];