Skip ELF notes with a p_vaddr of zero
Skip ELF notes with a p_vaddr of zero

Don't attempt to read data if the note isn't in an allocated segment.
See investigation starting at
https://bugs.chromium.org/p/crashpad/issues/detail?id=220#c27 for
details.

Bug: crashpad:220, crashpad:30, crashpad:196
Change-Id: I60eaacb83ad00ef33bde9079d25cc23a59bdf2c8
Reviewed-on: https://chromium-review.googlesource.com/941507
Reviewed-by: Joshua Peraza <f5809a5e35ec7e1bd0e25cb0a0b68bb433cf6f17@chromium.org>
Commit-Queue: Scott Graham <e134406e1863f3b48b0795831afac5c0595efb36@chromium.org>

chromium/crashpad,chromium/crashpad,chromium/crashpad