src: Finish assert() clean-up

From cleanup commit 0cecde304:
assert()s can be compiled away by #defining NDEBUG. Some build systems
do this. Using wl_abort gives a human readable error message and it
isn't compiled away.

That commit missed one final assert, presumably due to missing it with
grep because of a coding style issue. Fix that up, and remove inclusion
of <assert.h> as appropriate.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>

src/connection.c

@@ -26,7 +26,6 @@
 
 #define _GNU_SOURCE
 
-#include <assert.h>
 #include <math.h>
 #include <stdlib.h>
 #include <stdint.h>

src/event-loop.c

@@ -23,7 +23,6 @@
  * SOFTWARE.
  */
 
-#include <assert.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <errno.h>

src/wayland-client.c

@@ -37,7 +37,6 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <ctype.h>
-#include <assert.h>
 #include <fcntl.h>
 #include <poll.h>
 #include <pthread.h>

src/wayland-server.c

@@ -37,7 +37,6 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <dlfcn.h>
-#include <assert.h>
 #include <sys/time.h>
 #include <fcntl.h>
 #include <sys/eventfd.h>
@@ -1534,7 +1533,8 @@ wl_display_terminate(struct wl_display *display)
 	display->run = false;
 
 	ret = write(display->terminate_efd, &terminate, sizeof(terminate));
-	assert (ret >= 0 || errno == EAGAIN);
+	if (ret < 0 && errno != EAGAIN)
+		wl_abort("Write failed at shutdown\n");
 }
 
 WL_EXPORT void

src/wayland-shm.c

@@ -40,7 +40,6 @@
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <unistd.h>
-#include <assert.h>
 #include <signal.h>
 #include <pthread.h>
 #include <errno.h>