test-client: initialize input instance.

In seat_handle_capabilities, if input->pointer is not properly
initialized, then it will contain an arbitrary value and results
in the wl_pointer listener not getting registered if that value
is not 0/null.  Thus, use calloc to initialize the "input" instance.

This fixes https://bugs.freedesktop.org/show_bug.cgi?id=49937

Signed-off-by: U. Artie Eoff <ullysses.a.eoff@intel.com>

tests/test-client.c

@@ -250,7 +250,7 @@ handle_global(struct wl_display *_display, uint32_t id,
 			wl_display_bind(display->display,
 					id, &wl_compositor_interface);
 	} else if (strcmp(interface, "wl_seat") == 0) {
-		input = malloc(sizeof *input);
+		input = calloc(1, sizeof *input);
 		input->seat = wl_display_bind(display->display, id,
 					      &wl_seat_interface);
 		input->pointer_focus = NULL;