libsmack: check in accesses_apply() that rule has short labels

Check rule has short labels when only 'load' is available.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
libsmack: remove redundant strlen() call from accesses_apply()

Return value of snprintf() should give the same length as strlen()
would given that string fits into buffer.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
libsmack: remove redundant check for clear flag form accesses_apply()

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>