net/nanocoap: fix includes for nanocoap sock

examples/nanocoap_server/main.c

@@ -19,9 +19,7 @@
 
 #include <stdio.h>
 
-#include "net/nanocoap.h"
 #include "net/nanocoap_sock.h"
-
 #include "xtimer.h"
 
 #define COAP_INBUF_SIZE (256U)

sys/include/net/nanocoap_sock.h

@@ -23,6 +23,7 @@
 #include <stdint.h>
 #include <unistd.h>
 
+#include "net/nanocoap.h"
 #include "net/sock/udp.h"
 
 #ifdef __cplusplus

sys/net/application_layer/nanocoap/sock.c

@@ -22,7 +22,7 @@
 #include <string.h>
 #include <stdio.h>
 
-#include "net/nanocoap.h"
+#include "net/nanocoap_sock.h"
 #include "net/sock/udp.h"
 
 #define ENABLE_DEBUG (0)