Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
* breakpoint.c (bpstat_copy): Call RELEASE_VALUE on the new OLD_VAL.
gdb/testsuite/
* gdb.base/value-double-free.exp, gdb.base/value-double-free.c: New.