Fix warnings.

src/exec.rs

@@ -41,7 +41,6 @@ pub fn main() -> ! {
         initfs_length = initfs_length_opt.expect("missing INITFS_LENGTH");
 
         let iter = || raw_iter().filter(|var| !var.starts_with(b"INITFS_"));
-        let env_count = iter().count();
 
         iter().map(|var| var.to_owned()).collect::<Vec<_>>()
     };
@@ -71,7 +70,7 @@ pub fn main() -> ! {
 }
 
 unsafe fn spawn_initfs(initfs_start: usize, initfs_length: usize) {
-    let read = syscall::open("pipe:", syscall::O_CLOEXEC).expect("failed to open sync read pipe");
+    let read = syscall::open("pipe:", O_CLOEXEC).expect("failed to open sync read pipe");
 
     // The write pipe will not inherit O_CLOEXEC, but is closed by the daemon later.
     let write = syscall::dup(read, b"write").expect("failed to open sync write pipe");

src/initfs.rs

@@ -281,6 +281,6 @@ pub fn run(bytes: &'static [u8], sync_pipe: usize) -> ! {
             }
         }
     }
-    syscall::exit(0);
+    syscall::exit(0).expect("initfs: failed to exit");
     unreachable!()
 }

src/lib.rs

@@ -1,7 +1,6 @@
 #![no_std]
 #![feature(
     asm_const,
-    asm_sym,
     alloc_error_handler,
     core_intrinsics,
     lang_items,