crypto: arm/sha1 - Fix clang function cast warnings

Instead of casting the function which upsets clang for some reason,
change the assembly function siganture instead.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/arm/crypto/sha1_glue.c

@@ -21,31 +21,29 @@
 
 #include "sha1.h"
 
-asmlinkage void sha1_block_data_order(u32 *digest,
-		const unsigned char *data, unsigned int rounds);
+asmlinkage void sha1_block_data_order(struct sha1_state *digest,
+		const u8 *data, int rounds);
 
 int sha1_update_arm(struct shash_desc *desc, const u8 *data,
 		    unsigned int len)
 {
-	/* make sure casting to sha1_block_fn() is safe */
+	/* make sure signature matches sha1_block_fn() */
 	BUILD_BUG_ON(offsetof(struct sha1_state, state) != 0);
 
-	return sha1_base_do_update(desc, data, len,
-				   (sha1_block_fn *)sha1_block_data_order);
+	return sha1_base_do_update(desc, data, len, sha1_block_data_order);
 }
 EXPORT_SYMBOL_GPL(sha1_update_arm);
 
 static int sha1_final(struct shash_desc *desc, u8 *out)
 {
-	sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_block_data_order);
+	sha1_base_do_finalize(desc, sha1_block_data_order);
 	return sha1_base_finish(desc, out);
 }
 
 int sha1_finup_arm(struct shash_desc *desc, const u8 *data,
 		   unsigned int len, u8 *out)
 {
-	sha1_base_do_update(desc, data, len,
-			    (sha1_block_fn *)sha1_block_data_order);
+	sha1_base_do_update(desc, data, len, sha1_block_data_order);
 	return sha1_final(desc, out);
 }
 EXPORT_SYMBOL_GPL(sha1_finup_arm);