RFR: JDK-8297480: GetPrimitiveArrayCritical in imageioJPEG misses result - NULL check

[Matthias Baesken]

Seems there is a remaining GetPrimitiveArrayCritical in imageioJPEG that misses a result - NULL check, this should be added.

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Commit messages:
 - JDK-8297480

Changes: https://git.openjdk.org/jdk/pull/11312/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11312&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297480
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11312.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11312/head:pull/11312

PR: https://git.openjdk.org/jdk/pull/11312