selftests/ftrace: Add more tests for removing of function probes

Al Viro discovered a bug in the removing of function probes where if it had
a '*' at the beginning, it would fail to find any matches. That is, because
it reset the glob search string to the the initial string with a "MATCH_END"
type, instead of skipping the wildcard "*" it included it, where it would
not match any functions because "*" was being treated as a normal character
and not a wildcard one.

Link: http://lkml.kernel.org/r/[email protected]

Cc: Shuah Khan <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

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