src/main: remove excess newline in g_message()
src/main: remove excess newline in g_message()

g_message() already prints a newline by itself, thus adding one in the
text string results in an unintended extra newline.

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

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