RFR: 8235637: jhsdb jmap from OpenJDK 11.0.5 doesn't work if prelink is enabled

[Fairoz Matte]

Hi,

Please review this small change,
Updating error handling, to make sure "lib_base_diff = 0" is still a valid scenario even after calc_prelinked_load_address() call. 

JBS - https://bugs.openjdk.java.net/browse/JDK-8235637
Webrev - http://cr.openjdk.java.net/~fmatte/8235637/webrev.00/

This patch is provided by Yasumasa Suenaga

Thanks,
Fairoz