libuv.c: set m to 0 by default

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Setting m to 0 by default will prevent "error: ‘m’ may be used uninitialized in this function"
while compiling with the option -DLWS_WITH_LIBUV=ON.

lib/event-libs/libuv/libuv.c

@@ -503,7 +503,7 @@ static int
 elops_destroy_context1_uv(struct lws_context *context)
 {
 	struct lws_context_per_thread *pt;
-	int n, m;
+	int n, m = 0;
 
 	for (n = 0; n < context->count_threads; n++) {
 		int budget = 10000;