strerror(3): changed panic to 0

src/strerror.rs

@@ -15,7 +15,7 @@ extern "C" { fn strerror(errnum: c_int) -> *mut c_char; }
 /* wrapper function for use in Rust */
 pub fn raw_message(err: std::io::Error) -> String {
 	/* Get the raw OS error. If it’s None, what the hell is going on‽ */
-	let errno = err.raw_os_error().unwrap() as c_int;
+	let errno = err.raw_os_error().unwrap_or(0) as c_int;
 
 	/* Get a CStr from the error message so that it’s referenced and then
 	 * convert it to an owned value. If the string is not valid UTF-8, return