<AWT Dev> RFR: JDK-8262461: handle wcstombsdmp return value correctly in unix awt_InputMethod.c

[Matthias Baesken]

The function wcstombsdmp is called at a few places in awt_InputMethod.c.
This function needs checking of a NULL return value and freeing of the memory allocated by this function. However this is missing at one place in the file.

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Commit messages:
 - JDK-8262461

Changes: https://git.openjdk.java.net/jdk/pull/2747/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2747&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262461
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2747.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2747/head:pull/2747

PR: https://git.openjdk.java.net/jdk/pull/2747