Revert "shim/loop-dev: fix variable undefined error for musl"

This reverts commit d8f2855.

Author: fidencio

crates/shim/src/mount_linux.rs

@@ -813,21 +813,6 @@ pub fn setup_loop_dev(backing_file: &str, loop_dev: &str, params: &LoopParams) -
             &info,
         );
         #[cfg(target_env = "musl")]
-        let ret = libc::ioctl(
-            loop_dev.as_raw_fd() as libc::c_int,
-            LOOP_SET_STATUS64 as libc::c_int,
-            &info,
-        );
-        #[cfg(target_env = "gnu")]
-        if let Err(e) = nix::errno::Errno::result(ret) {
-            libc::ioctl(
-                loop_dev.as_raw_fd() as libc::c_int,
-                LOOP_CLR_FD as libc::c_ulong,
-                0,
-            );
-            return Err(Error::Nix(e));
-        }
-        #[cfg(target_env = "musl")]
         if let Err(e) = nix::errno::Errno::result(ret) {
             libc::ioctl(
                 loop_dev.as_raw_fd() as libc::c_int,