crypto: fcrypt - Remove 'do while(0)' loop for single statement macro

Remove the 'do while(0)' loop in the macro, as it is not needed for single
statement macros. Condense into one line.
Signed-off-by: Milan Djurovic <mdjurovic@zohomail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/fcrypt.c

@@ -63,10 +63,7 @@ do {								\
 } while (0)
 
 /* Rotate right one 64 bit number as a 56 bit number */
-#define ror56_64(k, n)						\
-do {								\
-	k = (k >> n) | ((k & ((1 << n) - 1)) << (56 - n));	\
-} while (0)
+#define ror56_64(k, n) (k = (k >> n) | ((k & ((1 << n) - 1)) << (56 - n)))
 
 /*
  * Sboxes for Feistel network derived from