Avoid testcase build failures with -Wunused-value
A number of testcases fail to build with -Wunused-value enabled.
This commit adds dummy values to avoid this.
gdb/testsuite/ChangeLog:
* gdb.cp/namespace.cc: Avoid build failure with -Wunused-value.
* gdb.cp/nsimport.cc: Likewise.
* gdb.cp/nsnested.cc: Likewise.
* gdb.cp/nsnoimports.cc: Likewise.
* gdb.cp/nsusing.cc: Likewise.
* gdb.cp/smartp.cc: Likewise.
* gdb.python/py-pp-integral.c: Likewise.
* gdb.python/py-pp-re-notag.c: Likewise.
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