RFR: 8261547: Minor memory leak reported for Metal Rendering pipeline [v3]

[Prasanta Sadhukhan]

> Memory leak fix for couple of strings.

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Change to char*

-------------

Changes:
  - all: https://git.openjdk.java.net/lanai/pull/182/files
  - new: https://git.openjdk.java.net/lanai/pull/182/files/fe4cedf3..29cb44b8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=lanai&pr=182&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=lanai&pr=182&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/lanai/pull/182.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/182/head:pull/182

PR: https://git.openjdk.java.net/lanai/pull/182