Ignore per-processes failures on dumping global dmabuf stats

Reading dmabuf FD references or map references can fail if a process
exits before its fdinfo or maps can be read. Instead of fast failing
in this case, return the dmabuf info for the remaining processes.

Bug: 216211354
Test: adb shell dmabuf_dump
Change-Id: I85a65cc69adae0b19fccdb50356df11cd71d646b
1 file changed