crypto: serpent-sse2 - clear CRYPTO_TFM_REQ_MAY_SLEEP in lrw and xts modes

LRW/XTS patches for serpent-sse2 forgot to add this. CRYPTO_TFM_REQ_MAY_SLEEP
should be cleared as sleeping between kernel_fpu_begin()/kernel_fpu_end() is
not allowed.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/serpent_sse2_glue.c

@@ -554,6 +554,7 @@ static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	};
 	int ret;
 
+	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	ret = lrw_crypt(desc, dst, src, nbytes, &req);
 	serpent_fpu_end(crypt_ctx.fpu_enabled);
 
@@ -579,6 +580,7 @@ static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	};
 	int ret;
 
+	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	ret = lrw_crypt(desc, dst, src, nbytes, &req);
 	serpent_fpu_end(crypt_ctx.fpu_enabled);
 
@@ -671,6 +673,7 @@ static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	};
 	int ret;
 
+	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	ret = xts_crypt(desc, dst, src, nbytes, &req);
 	serpent_fpu_end(crypt_ctx.fpu_enabled);
 
@@ -697,6 +700,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	};
 	int ret;
 
+	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	ret = xts_crypt(desc, dst, src, nbytes, &req);
 	serpent_fpu_end(crypt_ctx.fpu_enabled);