Revert "modsign: Abort modules_install when signing fails"

Revert "modsign: Abort modules_install when signing fails"

This reverts commit b0c19988ce1a0968f217762b5a45c13ae8f9c58a.

The commit was fine but is no longer needed as of commit 87b541b224c4
("kbuild: change if_changed_rule for multi-line recipe").  Let's go
back to using ";" to be consistent.

For some discussion, see:

https://lkml.kernel.org/r/CAK7LNASde0Q9S5GKeQiWhArfER4S4wL1=R_FW8q0++_X3T5=hQ@mail.gmail.com

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>