libbpf-rs: Bail out on error in bpf_object_regen.sh

When bpf_object_regen.sh encounters an error it will just ignore it.
That's not helpful and arguably actively wrong. Make sure that we bail
out when encountering an error.

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

Author: d-e-s-o

libbpf-rs/tests/bpf_object_regen.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 SRC=$(find bin/src/ -name "*.bpf.c")
 BPFTOOL=""