style: replace try with ?

src/lib.rs

@@ -386,19 +386,15 @@ impl<T> Daemonize<T> {
         unsafe {
             let pid_file_fd = maptry!(self.pid_file.clone(), create_pid_file);
 
-            try!(perform_fork(Some(self.exit_action)));
+            perform_fork(Some(self.exit_action))?;
 
-            try!(set_current_dir(&self.directory).map_err(|_| DaemonizeError::ChangeDirectory));
-            try!(set_sid());
+            set_current_dir(&self.directory).map_err(|_| DaemonizeError::ChangeDirectory)?;
+            set_sid()?;
             umask(self.umask);
 
-            try!(perform_fork(None));
+            perform_fork(None)?;
 
-            try!(redirect_standard_streams(
-                self.stdin,
-                self.stdout,
-                self.stderr
-            ));
+            redirect_standard_streams(self.stdin, self.stdout, self.stderr)?;
 
             let uid = maptry!(self.user, get_user);
             let gid = maptry!(self.group, get_group);
@@ -480,7 +476,7 @@ unsafe fn get_group(group: Group) -> Result<gid_t> {
     match group {
         Group::Id(id) => Ok(id),
         Group::Name(name) => {
-            let s = try!(CString::new(name).map_err(|_| DaemonizeError::GroupContainsNul));
+            let s = CString::new(name).map_err(|_| DaemonizeError::GroupContainsNul)?;
             match get_gid_by_name(&s) {
                 Some(id) => get_group(Group::Id(id)),
                 None => Err(DaemonizeError::GroupNotFound),
@@ -497,7 +493,7 @@ unsafe fn get_user(user: User) -> Result<uid_t> {
     match user {
         User::Id(id) => Ok(id),
         User::Name(name) => {
-            let s = try!(CString::new(name).map_err(|_| DaemonizeError::UserContainsNul));
+            let s = CString::new(name).map_err(|_| DaemonizeError::UserContainsNul)?;
             match get_uid_by_name(&s) {
                 Some(id) => get_user(User::Id(id)),
                 None => Err(DaemonizeError::UserNotFound),
@@ -511,7 +507,7 @@ unsafe fn set_user(user: uid_t) -> Result<()> {
 }
 
 unsafe fn create_pid_file(path: PathBuf) -> Result<libc::c_int> {
-    let path_c = try!(pathbuf_into_cstring(path));
+    let path_c = pathbuf_into_cstring(path)?;
 
     let fd = open(path_c.as_ptr(), libc::O_WRONLY | libc::O_CREAT, 0o666);
     if -1 == fd {
@@ -526,7 +522,7 @@ unsafe fn create_pid_file(path: PathBuf) -> Result<libc::c_int> {
 }
 
 unsafe fn chown_pid_file(path: PathBuf, uid: uid_t, gid: gid_t) -> Result<()> {
-    let path_c = try!(pathbuf_into_cstring(path));
+    let path_c = pathbuf_into_cstring(path)?;
     tryret!(
         libc::chown(path_c.as_ptr(), uid, gid),
         Ok(()),