Description: wcd9335: fix a incorrect use of kstrndup()
References:
 https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?h=for-5.3&id=a54988113985ca22e414e132054f234fc8a92604
Notes:
Bugs:
upstream: released (5.3-rc1) [a54988113985ca22e414e132054f234fc8a92604]
4.19-upstream-stable: N/A "Vulnerable code introduced in 5.1-rc1"
4.9-upstream-stable: N/A "Vulnerable code introduced in 5.1-rc1"
3.16-upstream-stable: N/A "Vulnerable code introduced in 5.1-rc1"
sid: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"