Switching to new style.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

src/hsm/cmd_challenge.c

@@ -21,8 +21,7 @@
 uint8_t challenge[256];
 uint8_t challenge_len = 0;
 
-int cmd_challenge()
-{
+int cmd_challenge() {
     uint8_t *rb = (uint8_t *) random_bytes_get(apdu.ne);
     if (!rb) {
         return SW_WRONG_LENGTH();