http: fix CURL_DISABLE_BEARER_AUTH breakage

When bearer auth was disabled, the if/else logic got wrong and caused
problems.

Follow-up to e92edfbef6
Fixes #11892
Reported-by: Aleksander Mazur
Closes #11895

lib/http.c

@@ -1139,6 +1139,8 @@ CURLcode Curl_http_input_auth(struct Curl_easy *data, bool proxy,
                 data->state.authproblem = TRUE;
               }
             }
+#else
+           ;
 #endif
 
     /* there may be multiple methods on one line, so keep reading */