qemu/uri: Use QueryParams type definition

Follow QEMU CODING_STYLE, use the type definition,
making that prototype match the following two.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20230605175647.88395-4-philmd@linaro.org>

include/qemu/uri.h

@@ -96,7 +96,7 @@ typedef struct QueryParams {
   QueryParam *p;       /* array of parameters */
 } QueryParams;
 
-struct QueryParams *query_params_new (int init_alloc);
+QueryParams *query_params_new (int init_alloc);
 extern QueryParams *query_params_parse (const char *query);
 extern void query_params_free (QueryParams *ps);