crypto: powerpc/sha256 - remove unneeded semicolon

Eliminate the following coccicheck warning:
./arch/powerpc/crypto/sha256-spe-glue.c:132:2-3: Unneeded
semicolon

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>