RFR: 8259343: [macOS] Update JNI error handling in Cocoa code. [v2]

[Phil Race]

> Proposed updates to JNI error handling.

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8259343: [macOS] Update JNI error handling in Cocoa code.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1967/files
  - new: https://git.openjdk.java.net/jdk/pull/1967/files/0e745aa6..08a41150

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1967&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1967&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1967.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1967/head:pull/1967

PR: https://git.openjdk.java.net/jdk/pull/1967