crypto: hisilicon/hpre - Fix a erroneous check after snprintf()

maillist inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8B6T4
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c97795014672



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This error handling looks really strange.
Check if the string has been truncated instead.

Fixes: 02ab9946 ("crypto: hisilicon - Fixed some tiny bugs of HPRE")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: JiangShui Yang <yangjiangshui@h-partners.com>