Fix warnings

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

src/rng/hwrng.c

@@ -32,7 +32,7 @@
 
 static void hwrng_start(void) {
 #if defined(ENABLE_EMULATION)
-    srand(time(0));
+    srand((unsigned int)time(NULL));
 #elif defined(ESP_PLATFORM)
     bootloader_random_enable();
 #endif
@@ -188,8 +188,7 @@ uint32_t hwrng_get(void) {
 
     while (true) {
         hwrng_lock();
-        bool empty = rb->empty;
-        if (!empty) {
+        if (!rb->empty) {
             v = hwrng_buf_del(rb);
             hwrng_unlock();
             break;
@@ -210,9 +209,8 @@ void hwrng_wait_full(void) {
 #endif
     while (true) {
         hwrng_lock();
-        bool full = rb->full;
         hwrng_unlock();
-        if (full) {
+        if (rb->full) {
             break;
         }
 #if defined(PICO_PLATFORM) || defined(ESP_PLATFORM)

src/rng/random.c

@@ -80,7 +80,7 @@ const uint8_t *random_bytes_get(size_t len) {
  */
 int random_fill_iterator(void *arg, unsigned char *out, size_t out_len) {
     random_fill_iterator_ctx_t *ctx = (random_fill_iterator_ctx_t *) arg;
-    uint32_t index = ctx ? ctx->index : 0;
+    uint8_t index = ctx ? ctx->index : 0;
     uint8_t n;
     int ret = 0;
 

src/rng/random.h

@@ -24,7 +24,7 @@
 #include <stdbool.h>
 
 typedef struct {
-    uint32_t index;
+    uint8_t index;
     volatile bool cancel;
 } random_fill_iterator_ctx_t;