ftrace:test.d--kprobe--kprobe_non_uniq_symbol.tc from ubuntu_kselftests_ftrace failed on 5.4 / 5.15

Issue found on B-hwe-5.4.0-173.191~18.04.1 F-5.4.0-173.191 and J-5.15.0-96.106, 5.15.0-100.110 in sru-20240205

This kprobe_non_uniq_symbol.tc test case came from stable update (bug 2049024) and landed in our Focal kernel since Ubuntu-5.4.0-173.191

For Jammy it came from stable update (bug 2049350) and landed in our Jammy kernel since Ubuntu-5.15.0-96.106

So this is not a regression, but a new test case.

Test log:
 Running './ftracetest -vvv test.d/kprobe/kprobe_non_uniq_symbol.tc'
 === Ftrace unit tests ===
 + initialize_ftrace
 + disable_tracing
 + echo 0
 + reset_tracer
 + echo nop
 + reset_trigger
 + [ -d events/synthetic ]
 ...
 + read line
 ...
 + read line
 ...
 + reset_events_filter
 + read line
 ...
 + reset_ftrace_filter
 + [ ! -f set_ftrace_filter ]
 + echo
 + grep -v ^# set_ftrace_filter
 + read t
 + disable_events
 + echo 0
 + [ -f set_event_pid ]
 + echo
 + [ -f set_ftrace_pid ]
 + echo
 + [ -f set_ftrace_notrace ]
 + echo
 + [ -f set_graph_function ]
 [1] Test failure of registering kprobe on non unique symbol
 + echo
 + tee set_graph_function set_graph_notrace
 + [ -f stack_trace_filter ]
 + echo
 + [ -f kprobe_events ]
 + echo
 + [ -f uprobe_events ]
 + echo
 + [ -f synthetic_events ]
 + echo
 + [ -f snapshot ]
 + echo 0
 + clear_trace
 + echo
 + enable_tracing
 + echo 1
 + . /home/ubuntu/autotest/client/tmp/ubuntu_kselftests_ftrace/src/linux/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_non_uniq_symbol.tc
 + SYMBOL=name_show
 + grep -c -E [[:alnum:]]+ t name_show /proc/kallsyms
 + [ 14 -le 1 ]
 + echo p:test_non_unique name_show
     [FAIL]

 # of passed: 0
 # of failed: 1
 # of unresolved: 0
 # of untested: 0
 # of unsupported: 0
 # of xfailed: 0
 # of undefined(test bug): 0

I think we're probably missing https://github.com/torvalds/linux/commit/b022f0c7e404887a7c5229788fc99eff9f9a80d5