RFR: 8375370: XRBackendNative.c reported variable uninitialized by clang23 [v2]

[SendaoYan]

> Hi all,
> 
> The local variable `pict_attr` in function `JNIEXPORT jint JNICALL Java_sun_java2d_xr_XRBackendNative_createPictureNative  (JNIEnv *env, jclass cls, jint drawable, jlong formatPtr)` reported variable uninitialized by clang23. This PR initial all the fields of`pict_attr` to zero which will avoid compiler warning by clang23.

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

  Initial all the fields of pict_attr to zero

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29248/files
  - new: https://git.openjdk.org/jdk/pull/29248/files/1380681c..f6949885

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29248&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29248&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29248.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29248/head:pull/29248

PR: https://git.openjdk.org/jdk/pull/29248