RFR: 8371587: Final mapping lost in ProcSmapsParser::parse_next

[Albert Mingkun Yang]

A simple fix for off-by-one error in parsing `smaps` -- the final mapping is never recorded as we exits the parsing loop too early.

Test: tier1

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Commit messages:
 - smap-parser

Changes: https://git.openjdk.org/jdk/pull/28225/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28225&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371587
  Stats: 12 lines in 1 file changed: 1 ins; 4 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/28225.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28225/head:pull/28225

PR: https://git.openjdk.org/jdk/pull/28225