[Bug 255698] dlerror() returns non-NULL after a successful call to dlopen()/dlsym()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255698

--- Comment #1 from Eugene M. Kim <astralblue at gmail.com> ---
Actual result (taken on a -CURRENT system, built from main branch commit
34abb05be77a32a2b2673fb4b85eaa53a3d1446e, note dlerror() returns non-NULL on
the first dlerror() call, even after a successful dlopen() and also before the
first dlopen(), also note the dlerror() message after a successful dlopen() is
from the previous failure):

dlerror()=0x800222770 ()
dlerror()=0x0
dlopen(/foobar.so, RTLD_NOW)=0x0
dlerror()=0x800222770 (Cannot open "/foobar.so")
dlerror()=0x0
dlopen(/usr/lib/libm.so, RTLD_NOW)=0x800226808
dlerror()=0x800222770 (Cannot open "/foobar.so")
dlerror()=0x0

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