[media] s5p-jpeg: return error immediately after get_byte fails

When parsing JPEG header s5p_jpeg_parse_hdr function
should return immediately in case there was an error
while reading a byte.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>