greybus: manifest: fix the placement of arguments to pr_err

We're one character out here in the placement of the inputs to pr_err().
Later patches show this up when pushing through checkpatch.pl. This patch
fixes by moving the offending variables one character left.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>