app/bbdev: use strcpy for allocated string

app/bbdev: use strcpy for allocated string

app/test-bbdev/test_bbdev_vector.c:895:3:
  error: ‘strncpy’ output truncated before terminating nul copying as
  many bytes from a string as its length [-Werror=stringop-truncation]
   strncpy(entry, line, strlen(line));
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

app/test-bbdev/test_bbdev_vector.c:917:5:
  error: ‘strncat’ output truncated before terminating nul copying as
  many bytes from a string as its length [-Werror=stringop-truncation]
   strncat(entry, line, strlen(line));
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: f714a18885a6 ("app/testbbdev: add test application for bbdev")
Cc: stable@dpdk.org
Signed-off-by: Andy Green <andy@warmcat.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>