libpagemap: fix reusing previous name for mappings with no name

Mappings that are not from a file do not have a name.  The sscanf
will read all of the fields up to the name, and then leave name
untouched.  This causes the previous name to be reused.  Reset
name to an empty string before each call to sscanf.

Change-Id: Ib146732983eb074d0d4773be094efa0b672f5ed2
1 file changed