Remove kretprobe__ prefix from program names

Such prefixes are currently removed for kprobes, tracepoints, and raw
tracepoints, but not for kretprobes.  This commit removes it for
kretprobe as well, for consistency.

Signed-off-by: Paul Chaignon <paul.chaignon@orange.com>

src/cc/libbpf.c

@@ -539,6 +539,8 @@ int bcc_prog_load_xattr(struct bpf_load_program_attr *attr, int prog_len,
   if (name_len) {
     if (strncmp(attr->name, "kprobe__", 8) == 0)
       name_offset = 8;
+    else if (strncmp(attr->name, "kretprobe__", 11) == 0)
+      name_offset = 11;
     else if (strncmp(attr->name, "tracepoint__", 12) == 0)
       name_offset = 12;
     else if (strncmp(attr->name, "raw_tracepoint__", 16) == 0)