crypto: Fix whitespace errors

sys/include/crypto/modes/ccm.h

@@ -80,7 +80,7 @@ int cipher_encrypt_ccm(cipher_t* cipher, uint8_t* auth_data,
  * @param input_len        length of the input data
  * @param output           pointer to allocated memory for decrypted data. It
  *                         has to be of size data_len - mac_length.
- * 
+ *
  * @return                 Length of the decrypted data on a successful decryption
  * @return                 A negative error code if something went wrong
  */

sys/include/crypto/modes/ctr.h

@@ -40,7 +40,7 @@ extern "C" {
  * @param length        length of the input data
  * @param output        pointer to allocated memory for encrypted data. It has
  *                      to be of size data_len.
- * 
+ *
  * @return              Length of encrypted data on a successful encryption
  * @return              A negative error code if something went wrong
  */
@@ -64,10 +64,9 @@ int cipher_encrypt_ctr(cipher_t* cipher, uint8_t nonce_counter[16],
  * @param length        length of the input data
  * @param output        pointer to allocated memory for encrypted data. It has
  *                      to be of size data_len.
- * 
+ *
  * @return              Length of decrypted data on a successful decryption
  * @return              A negative error code if something went wrong
- * 
  */
 int cipher_decrypt_ctr(cipher_t* cipher, uint8_t nonce_counter[16],
                        uint8_t nonce_len, uint8_t* input, size_t length,

sys/include/crypto/modes/ecb.h

@@ -37,7 +37,7 @@ extern "C" {
  * @param length     length of the input data
  * @param output     pointer to allocated memory for encrypted data. It has to
  *                   be of size data_len + BLOCK_SIZE - data_len % BLOCK_SIZE.
- * 
+ *
  * @return           Length of encrypted data on a successful encryption
  * @return           A negative error code if something went wrong
  *
@@ -55,10 +55,9 @@ int cipher_encrypt_ecb(cipher_t* cipher, uint8_t* input, size_t length,
  * @param length     length of the input data
  * @param output     pointer to allocated memory for plaintext data. It has to
  *                   be of size `lengh`.
- * 
+ *
  * @return           Length of decrypted data on a successful decryption
  * @return           A negative error code if something went wrong
- * 
  */
 int cipher_decrypt_ecb(cipher_t* cipher, uint8_t* input, size_t length,
                        uint8_t* output);