RFR: 8275080: G1CollectedHeap::expand() returns the wrong value

[Man Cao]

Hi all,

Could we get reviews for this minor bug fix? See https://bugs.openjdk.java.net/browse/JDK-8275080 for details.
It is authored by colleague Jonathan Joo, and he tested locally with jtreg tier1 and DaCapo benchmarks.

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Commit messages:
 - Fix expand output

Changes: https://git.openjdk.java.net/jdk/pull/6178/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6178&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275080
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6178.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6178/head:pull/6178

PR: https://git.openjdk.java.net/jdk/pull/6178