libkmod: modinfo: fix sig_id output
libkmod: modinfo: fix sig_id output

For some reason the key for sig_id was set to "signature". The
length was calculated against the proper string, as the result in
the output it was truncated to "signat".

Pass the proper key to the kmod_module_info_append() call.

Signed-off-by: Yauheni Kaliuta <0d6c66cf06ee77089f9b834ad16e0f050cf87c60@redhat.com>

pmmccorm/kmod,pmmccorm/kmod,lucasdemarchi/kmod,pmmccorm/kmod,lucasdemarchi/kmod,lucasdemarchi/kmod