media: usb: fix spelling mistake: "synchronuously" -> "synchronously"

Trivial fix to spelling mistake in error message text

[mchehab@s-opensource.org: folded all similar patches into one]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>