crypto: ghash-intel - Fix irq_fpu_usable usage

When renaming kernel_fpu_using to irq_fpu_usable, the semantics of the
function is changed too, from mesuring whether kernel is using FPU,
that is, the FPU is NOT available, to measuring whether FPU is usable,
that is, the FPU is available.

But the usage of irq_fpu_usable in ghash-clmulni-intel_glue.c is not
changed accordingly. This patch fixes this.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/ghash-clmulni-intel_glue.c

@@ -159,7 +159,7 @@ static int ghash_async_init(struct ahash_request *req)
 	struct ahash_request *cryptd_req = ahash_request_ctx(req);
 	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
 
-	if (irq_fpu_usable()) {
+	if (!irq_fpu_usable()) {
 		memcpy(cryptd_req, req, sizeof(*req));
 		ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
 		return crypto_ahash_init(cryptd_req);
@@ -177,7 +177,7 @@ static int ghash_async_update(struct ahash_request *req)
 {
 	struct ahash_request *cryptd_req = ahash_request_ctx(req);
 
-	if (irq_fpu_usable()) {
+	if (!irq_fpu_usable()) {
 		struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 		struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
 		struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
@@ -195,7 +195,7 @@ static int ghash_async_final(struct ahash_request *req)
 {
 	struct ahash_request *cryptd_req = ahash_request_ctx(req);
 
-	if (irq_fpu_usable()) {
+	if (!irq_fpu_usable()) {
 		struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 		struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
 		struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
@@ -216,7 +216,7 @@ static int ghash_async_digest(struct ahash_request *req)
 	struct ahash_request *cryptd_req = ahash_request_ctx(req);
 	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
 
-	if (irq_fpu_usable()) {
+	if (!irq_fpu_usable()) {
 		memcpy(cryptd_req, req, sizeof(*req));
 		ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
 		return crypto_ahash_digest(cryptd_req);