fix -Wstrict-prototypes issues

apps/blecsc/src/main.c

@@ -147,7 +147,7 @@ blecsc_advertise(void)
  *                         10^6 * speed [kph]
  */
 static void
-blecsc_simulate_speed_and_cadence()
+blecsc_simulate_speed_and_cadence(void)
 {
     uint16_t wheel_rev_period;
     uint16_t crank_rev_period;

apps/bttester/src/gatt.c

@@ -1336,7 +1336,7 @@ fail:
 		   BTP_STATUS_FAILED);
 }
 
-static void read_destroy()
+static void read_destroy(void)
 {
 	gatt_buf_clear();
 }

apps/bttester/src/l2cap.c

@@ -108,7 +108,7 @@ static void unstalled_cb(uint16_t conn_handle, struct ble_l2cap_chan *chan,
 	}
 }
 
-static struct channel *get_free_channel()
+static struct channel *get_free_channel(void)
 {
 	u8_t i;
 	struct channel *chan;

nimble/controller/include/controller/ble_ll.h

@@ -568,7 +568,7 @@ extern uint32_t g_bletest_IVs;
 #endif
 
 #if MYNEWT_VAL(BLE_LL_DIRECT_TEST_MODE)
-void ble_ll_dtm_init();
+void ble_ll_dtm_init(void);
 #endif
 
 #ifdef __cplusplus

nimble/host/test/src/ble_hs_conn_test.c

@@ -27,7 +27,7 @@
 #include "ble_hs_test_util.h"
 
 static int
-ble_hs_conn_test_util_any()
+ble_hs_conn_test_util_any(void)
 {
     struct ble_hs_conn *conn;
 

nimble/transport/uart/src/ble_hci_uart.c

@@ -591,7 +591,7 @@ ble_hci_uart_rx_skip_cmd(uint8_t data)
 
 #if MYNEWT_VAL(BLE_HOST)
 static inline void
-ble_hci_uart_rx_evt_cb()
+ble_hci_uart_rx_evt_cb(void)
 {
     int rc;
 

porting/npl/linux/test/test_npl_callout.c

@@ -56,7 +56,7 @@ void on_callout(struct ble_npl_event *ev)
  * ble_npl_callout_init(struct ble_npl_callout *c, struct ble_npl_eventq *evq,
  *                 ble_npl_event_fn *ev_cb, void *ev_arg)
  */
-int test_init()
+int test_init(void)
 {
     ble_npl_callout_init(&s_callout,
 		    &s_eventq,
@@ -65,19 +65,19 @@ int test_init()
     return PASS;
 }
 
-int test_queued()
+int test_queued(void)
 {
   //VerifyOrQuit(ble_npl_callout_queued(&s_callout),
   //	 "callout: not queued when expected");
     return PASS;
 }
 
-int test_reset()
+int test_reset(void)
 {
     return ble_npl_callout_reset(&s_callout, TEST_INTERVAL);
 }
 
-int test_stop()
+int test_stop(void)
 {
     return PASS;
 }

porting/npl/linux/test/test_npl_eventq.c

@@ -58,7 +58,7 @@ void on_event(struct ble_npl_event *ev)
     s_tests_running = false;
 }
 
-int test_init()
+int test_init(void)
 {
     //VerifyOrQuit(!ble_npl_eventq_inited(&s_eventq), "eventq: empty q initialized");
     ble_npl_eventq_init(&s_eventq);
@@ -67,7 +67,7 @@ int test_init()
     return PASS;
 }
 
-int test_run()
+int test_run(void)
 {
     while (s_tests_running)
     {
@@ -77,7 +77,7 @@ int test_run()
     return PASS;
 }
 
-int test_put()
+int test_put(void)
 {
     s_event.ev_cb = on_event;
     s_event.ev_arg = &s_event_args;
@@ -85,13 +85,13 @@ int test_put()
     return PASS;
 }
 
-int test_get_no_wait()
+int test_get_no_wait(void)
 {
     //struct ble_npl_event *ev = ble_npl_eventq_get_no_wait(&s_eventq);
     return FAIL;
 }
 
-int test_get()
+int test_get(void)
 {
     struct ble_npl_event *ev = ble_npl_eventq_get(&s_eventq,
 						  BLE_NPL_WAIT_FOREVER);

porting/npl/linux/test/test_npl_mempool.c

@@ -37,7 +37,7 @@ static void *s_memblock[TEST_MEMPOOL_BLOCKS];
  *                            int block_size, void *membuf, char *name);
  *
  */
-int test_init()
+int test_init(void)
 {
     int err;
     err = ble_npl_mempool_init(NULL,
@@ -60,7 +60,7 @@ int test_init()
  *
  * bool ble_npl_mempool_is_sane(const struct ble_npl_mempool *mp);
  */
-int test_is_sane()
+int test_is_sane(void)
 {
     return (ble_npl_mempool_is_sane(&s_mempool)) ? PASS : FAIL;
 }
@@ -75,7 +75,7 @@ int test_is_sane()
  *
  * int ble_npl_memblock_from(const struct ble_npl_mempool *mp, const void *block_addr);
  */
-int test_stress()
+int test_stress(void)
 {
     int loops = 3;
     while(loops--)

porting/npl/linux/test/test_npl_task.c

@@ -67,7 +67,7 @@ void *task1_run(void *args)
  *                  ble_npl_stack_t *stack_bottom, uint16_t stack_size)
  *
  */
-int test_init()
+int test_init(void)
 {
     int err;
     err = ble_npl_task_init(NULL,