wininet: Reset buffer size before each call to HTTP_HttpQueryInfoW.

Otherwise when headers contain multiple entries like

WWW-Authenticate: Negotiate
WWW-Authenticate: Basic realm="SAMPLE.COM"

then 2nd query fails because buffer size is shorter than the header value.

Signed-off-by: Dmitry Timoshkov <dmitry@baikal.ru>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/wininet/http.c

@@ -5125,6 +5125,8 @@ static DWORD HTTP_HttpSendRequestW(http_request_t *request, LPCWSTR lpszHeaders,
                             loop_next = TRUE;
                             break;
                         }
+
+                        dwBufferSize = 2048;
                     }
                     heap_free( host );
 
@@ -5153,6 +5155,8 @@ static DWORD HTTP_HttpSendRequestW(http_request_t *request, LPCWSTR lpszHeaders,
                             loop_next = TRUE;
                             break;
                         }
+
+                        dwBufferSize = 2048;
                     }
 
                     if(!loop_next) {