Remove unnecessary cast

Author: tiif

tests/pass-dep/libc/libc-eventfd.rs

@@ -11,8 +11,7 @@ fn main() {
 }
 
 fn read_bytes<const N: usize>(fd: i32, buf: &mut [u8; N]) -> i32 {
-    let res: i32 =
-        unsafe { libc::read(fd, buf.as_mut_ptr().cast(), N as libc::size_t).try_into().unwrap() };
+    let res: i32 = unsafe { libc::read(fd, buf.as_mut_ptr().cast(), N).try_into().unwrap() };
     return res;
 }