src/main: print directory only when debugging is enabled
src/main: print directory only when debugging is enabled

Otherwise this is too verbose

Signed-off-by: Enrico Jorns <a2e5f936c390f36494e46e71bcfbe365bb1e8c49@pengutronix.de>

jluebbe/rauc,jluebbe/rauc,jluebbe/rauc,rauc/rauc,ejoerns/rauc,ejoerns/rauc,rauc/rauc,rauc/rauc,ejoerns/rauc