Fix edp-idf

Author: newpavlov

src/backends/esp_idf.rs

@@ -21,12 +21,11 @@ extern "C" {
 }
 
 pub fn u32() -> Result<u32, Error> {
-    Ok(esp_random())
+    Ok(unsafe { esp_random() })
 }
 
 pub fn u64() -> Result<u64, Error> {
-    let a = esp_random();
-    let b = esp_random();
+    let (a, b) = unsafe { (esp_random(), esp_random()) };
     let res = (u64::from(a) << 32) | u64::from(b);
     Ok(res)
 }