Fix CLI return code on --help for ethkey, ethstore & whisper

ethkey/cli/src/main.rs

@@ -166,10 +166,11 @@ fn main() {
 
 	match execute(env::args()) {
 		Ok(ok) => println!("{}", ok),
+		Err(Error::Docopt(ref e)) => e.exit(),
 		Err(err) => {
 			println!("{}", err);
 			process::exit(1);
-		},
+		}
 	}
 }
 

ethstore/cli/src/main.rs

@@ -149,6 +149,7 @@ fn main() {
 
 	match execute(env::args()) {
 		Ok(result) => println!("{}", result),
+		Err(Error::Docopt(ref e)) => e.exit(),
 		Err(err) => {
 			println!("{}", err);
 			process::exit(1);

whisper/cli/src/main.rs

@@ -190,11 +190,12 @@ fn main() {
 		Ok(_) => {
 			println!("whisper-cli terminated");
 			process::exit(1);
-		}
+		},
+		Err(Error::Docopt(ref e)) => e.exit(),
 		Err(err) => {
 			println!("{}", err);
 			process::exit(1);
-		},
+		}
 	}
 }