crypto: inside-secure - remove null check before kfree

Kfree on NULL pointer is a no-op and therefore checking is redundant.

Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/inside-secure/safexcel_hash.c

@@ -308,10 +308,8 @@ unmap_cache:
 		ctx->base.cache_sz = 0;
 	}
 free_cache:
-	if (ctx->base.cache) {
 	kfree(ctx->base.cache);
 	ctx->base.cache = NULL;
-	}
 
 unlock:
 	spin_unlock_bh(&priv->ring[ring].egress_lock);