crypto: ecc - Add comment to ecc_digits_from_bytes about input byte array

Add comment to ecc_digits_from_bytes kdoc that the first byte is expected
to hold the most significant bits of the large integer that is converted
into an array of digits.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/crypto/internal/ecc.h

@@ -63,6 +63,9 @@ static inline void ecc_swap_digits(const void *in, u64 *out, unsigned int ndigit
  * @nbytes    Size of input byte array
  * @out       Output digits array
  * @ndigits:  Number of digits to create from byte array
+ *
+ * The first byte in the input byte array is expected to hold the most
+ * significant bits of the large integer.
  */
 void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
 			   u64 *out, unsigned int ndigits);