Revert "Allow unused_unsafe warning"

This reverts commit 234b862.

src/sys/quota.rs

@@ -22,7 +22,6 @@ struct QuotaCmd(QuotaSubCmd, QuotaType);
 
 impl QuotaCmd {
     fn as_int(&self) -> c_int {
-        #[allow(unused_unsafe)]
         unsafe { libc::QCMD(self.0 as i32, self.1 as i32) }
     }
 }

src/sys/wait.rs

@@ -118,37 +118,30 @@ impl WaitStatus {
 }
 
 fn exited(status: i32) -> bool {
-    #[allow(unused_unsafe)]
     unsafe { libc::WIFEXITED(status) }
 }
 
 fn exit_status(status: i32) -> i32 {
-    #[allow(unused_unsafe)]
     unsafe { libc::WEXITSTATUS(status) }
 }
 
 fn signaled(status: i32) -> bool {
-    #[allow(unused_unsafe)]
     unsafe { libc::WIFSIGNALED(status) }
 }
 
 fn term_signal(status: i32) -> Result<Signal> {
-    #[allow(unused_unsafe)]
     Signal::try_from(unsafe { libc::WTERMSIG(status) })
 }
 
 fn dumped_core(status: i32) -> bool {
-    #[allow(unused_unsafe)]
     unsafe { libc::WCOREDUMP(status) }
 }
 
 fn stopped(status: i32) -> bool {
-    #[allow(unused_unsafe)]
     unsafe { libc::WIFSTOPPED(status) }
 }
 
 fn stop_signal(status: i32) -> Result<Signal> {
-    #[allow(unused_unsafe)]
     Signal::try_from(unsafe { libc::WSTOPSIG(status) })
 }
 
@@ -158,7 +151,6 @@ fn syscall_stop(status: i32) -> bool {
     // of delivering SIGTRAP | 0x80 as the signal number for syscall
     // stops. This allows easily distinguishing syscall stops from
     // genuine SIGTRAP signals.
-    #[allow(unused_unsafe)]
     unsafe { libc::WSTOPSIG(status) == libc::SIGTRAP | 0x80 }
 }
 
@@ -168,7 +160,6 @@ fn stop_additional(status: i32) -> c_int {
 }
 
 fn continued(status: i32) -> bool {
-    #[allow(unused_unsafe)]
     unsafe { libc::WIFCONTINUED(status) }
 }