Replace constant with variable

Author: newpavlov

src/use_file.rs

@@ -38,7 +38,7 @@ fn get_rng_fd() -> Result<libc::c_int, Error> {
     #[cold]
     fn init_or_wait_fd() -> Result<libc::c_int, Error> {
         // Maximum sleep time (~268 milliseconds)
-        const MAX_SLEEP_NS: libc::c_long = 1 << 28;
+        let max_sleep_ns = 1 << 28;
         // Starting sleep time (~4 microseconds)
         let mut timeout_ns = 1 << 12;
         loop {
@@ -56,7 +56,7 @@ fn get_rng_fd() -> Result<libc::c_int, Error> {
                     unsafe {
                         libc::nanosleep(&rqtp, &mut rmtp);
                     }
-                    if timeout_ns < MAX_SLEEP_NS {
+                    if timeout_ns < max_sleep_ns {
                         timeout_ns *= 2;
                     }
                     continue;