Condition is always false in 'ProcessHandleImpl.Info#toString'

[Andrey Turbanov]

Hello.
I found suspicious code in the method java.lang.ProcessHandleImpl.Info#toString
https://github.com/openjdk/jdk/blob/master/src/java.base/share/classes/java/lang/ProcessHandleImpl.java#L645
```
StringBuilder sb = new StringBuilder(60);
sb.append('[');
if (user != null) {
    sb.append("user: ");
    sb.append(user());
}
if (command != null) {
    if (sb.length() != 0) sb.append(", ");
    sb.append("cmd: ");
    sb.append(command);
}
```
Opening bracket '[' is added unconditionally to the StringBuilder.
But then the code checks "if (sb.length() != 0)"
This condition will always be *false*.
Looks like comparison with 1 should be used instead.


Andrey Turbanov