Some shared libraries specify mappings that leave a gap (actually a
MAP_GUARD mapping) in between the file mappings (libcrypto.so was
the one I found), and this would cause rd_loadobj_iter() to report
the mapping info incorrectly, leaving out rdl_path and misreporting
rdl_offset for file mappings after the gap.  Fix rd_loadobj_iter()
to handle this situation.

Reviewed by:	markj
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D32950