crypto: Make hifn_795x build depend on !ARCH_DMA_ADDR_T_64BIT

hifn_795x works only on 32 bit, remove the detection while loading
the module and catch non-32 bit systems at build time.
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/Kconfig

@@ -200,6 +200,7 @@ config CRYPTO_DEV_HIFN_795X
 	select CRYPTO_BLKCIPHER
 	select HW_RANDOM if CRYPTO_DEV_HIFN_795X_RNG
 	depends on PCI
+	depends on !ARCH_DMA_ADDR_T_64BIT
 	help
 	  This option allows you to have support for HIFN 795x crypto adapters.
 

drivers/crypto/hifn_795x.c

@@ -2744,10 +2744,8 @@ static int __init hifn_init(void)
 	unsigned int freq;
 	int err;
 
-	if (sizeof(dma_addr_t) > 4) {
-		printk(KERN_INFO "HIFN supports only 32-bit addresses.\n");
-		return -EINVAL;
-	}
+	/* HIFN supports only 32-bit addresses */
+	BUILD_BUG_ON(sizeof(dma_addr_t) != 4);
 
 	if (strncmp(hifn_pll_ref, "ext", 3) &&
 	    strncmp(hifn_pll_ref, "pci", 3)) {