staging: media: atomisp: replace sprintf() with strscpy()

staging: media: atomisp: replace sprintf() with strscpy()

Auditing calls to sprintf(). This code is fine because we are
copying 9 characters into a 52 character buffer. But it would
be cleaner to use strscpy() instead. Additionally, the 2-argument
version of strscpy() checks at compile time that dst is an array,
not just a pointer.

This is the only sprintf() call in the whole driver.

Signed-off-by: Tomasz Unger <tomasz.unger@yahoo.pl>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>