remove redundant code in do_dlsym function
remove redundant code in do_dlsym function

commit 637dd2d383cc1f63bf02a732f03786857b22c7bd introduced the checks
for RTLD_DEFAULT and RTLD_NEXT here, claiming they fixed a regression,
but the above conditional block clearly already covered these cases,
and removing the checks produces no difference in the generated code.

chardi/musl,chardi/musl,chardi/musl