Fix memory leak of FileDescriptorInfo object.

Bug: 231366539

Test: After fixing, there is no 192 byte leak present in most zygote
Test: forked processes.
Change-Id: Ie88e2fac76ba0da92c434d2db107885253855696
Merged-In: Ie88e2fac76ba0da92c434d2db107885253855696
(cherry picked from commit 60e4b9c43c8985a96ececf8b15e1f7e44f6b4c8f)
1 file changed