HPROF: Bogus assert error on depth > 0 in hprof_trace.c

The test demo/jvmti/hprof/OptionsTest fails when run with the debug version of hprof:

Starting: /u/builds/serviceability/ssn_unix/ssn_wscopy/build/solaris-i586/j2sdk-image/jre/bin/java -Dtest.classes=/u/builds/serviceability/ssn_unix/jbuild_mho_ssn_solaris_i386_05-04-25T01-22_1/regress_1.solaris-i386/JTwork/classes/demo/jvmti/hprof -agentlib:hprof=cpu=samples,depth=0 HelloWorld
ASSERTION FAILURE: depth > 0 [../../../src/share/demo/jvmti/hprof/hprof_trace.c:639]
HPROF DUMPING CORE
Exit code is 6
<beginning of Error Stream buffer>
ASSERTION FAILURE: depth > 0 [../../../src/share/demo/jvmti/hprof/hprof_trace.c:639]
HPROF DUMPING CORE


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