JNI/x86: Fix art_jni_unlock_object_no_inline.

Fix a small issue from
    https://android-review.googlesource.com/1903379
for x86. (The same was done correctly for x86-64.)

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 172332525
Change-Id: Ib8be2de88035d4d39738ca3076902a2e2b7d4461
2 files changed