media: zoran: fix compiler warning

In file included from media-git/include/linux/bitmap.h:9,
                 from media-git/include/linux/cpumask.h:12,
                 from media-git/arch/x86/include/asm/cpumask.h:5,
                 from media-git/arch/x86/include/asm/msr.h:11,
                 from media-git/arch/x86/include/asm/processor.h:21,
                 from media-git/arch/x86/include/asm/cpufeature.h:5,
                 from media-git/arch/x86/include/asm/thread_info.h:53,
                 from media-git/include/linux/thread_info.h:38,
                 from media-git/arch/x86/include/asm/preempt.h:7,
                 from media-git/include/linux/preempt.h:81,
                 from media-git/include/linux/spinlock.h:51,
                 from media-git/include/linux/seqlock.h:36,
                 from media-git/include/linux/time.h:6,
                 from media-git/include/linux/stat.h:19,
                 from media-git/include/linux/module.h:10,
                 from media-git/drivers/staging/media/zoran/zoran_driver.c:44:
In function 'strncpy',
    inlined from 'zoran_querycap' at media-git/drivers/staging/media/zoran/zoran_driver.c:1512:2:
media-git/include/linux/string.h:246:9: warning: '__builtin_strncpy' output may be truncated copying 31 bytes from a string of length 31 [-Wstringop-truncation]
  return __builtin_strncpy(p, q, size);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>