staging: bcm2835-camera: Fix comment typos.

Fix a typo flagged by checkpatch, and another in the same line.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>