refactor(warteraum/auth): fix -Wstrict-prototypes warning

Author: sternenseemann

warteraum/auth.c

@@ -12,7 +12,7 @@ static struct http_string_s salt;
 // easily loop through them.
 static struct http_string_s tokens;
 
-bool auth_init() {
+bool auth_init(void) {
   http_string_clear(&salt);
   http_string_clear(&tokens);
 
@@ -41,7 +41,7 @@ bool auth_init() {
   }
 }
 
-void auth_cleanup() {
+void auth_cleanup(void) {
   http_string_free(&salt);
   http_string_free(&tokens);
 }

warteraum/auth.h

@@ -18,8 +18,8 @@
              (const uint8_t *) salt.buf, salt.len,                      \
              SCRYPT_N, SCRYPT_r, SCRYPT_p, output, SCRYPT_OUTPUT_LEN)
 
-bool auth_init();
-void auth_cleanup();
+bool auth_init(void);
+void auth_cleanup(void);
 
 bool auth_verify(struct http_string_s token);