samples: bpf: add ibumad sample to .gitignore

This commit adds ibumad to .gitignore which is
currently ommited from the ignore file.

Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
diff --git a/samples/bpf/.gitignore b/samples/bpf/.gitignore
index c749845..74d31fd 100644
--- a/samples/bpf/.gitignore
+++ b/samples/bpf/.gitignore
@@ -1,6 +1,7 @@
 cpustat
 fds_example
 hbm
+ibumad
 lathist
 lwt_len_hist
 map_perf_test