Message logged by 'dev_xxx()' or 'pr_xxx()' should end with a '\n'.

Fixes: 791c13b7 ("remoteproc: Fix NULL pointer dereference in rproc_virtio_notify")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/20200411160750.32573-1-christophe.jaillet@wanadoo.frSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>