RFR: 8253829: Wrong length compared in SSPI bridge

[Weijun Wang]

For two principals to be the same, they are either all "user at R", or one is "user" and the other is "user at R". The check
here wants to fail early if the length are different. "l" is the whole length and "r" is the length of the name
(without realm). The comparison should be reflective but there is a typo.

For example, for "user at R" and "user", l1 = 6, l2 = 4, r1 = 4, r2 = 4, the check will succeed and the names are treated
as different. This is not the expected behavior.

No regression test because we don't support SSPI testing in the OpenJDK repo now.

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Commit messages:
 - 8253829: Wrong length compared in SSPI bridge

Changes: https://git.openjdk.java.net/jdk/pull/419/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=419&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253829
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/419.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/419/head:pull/419

PR: https://git.openjdk.java.net/jdk/pull/419