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Fix use-after-free error in ppc/plt.c

Will Schmidt requested to merge willschm/ltrace:ltrace-ppc-fix-plt-use-after-free into main

This resolves an error reported with a newer GCC. The libsym pointer is referenced after it is freed.

plt.c: In function 'arch_elf_add_func_entry': plt.c:702:25: error: pointer 'libsym' used after 'free' [-Werror=use-after-free] 702 | delete_symbol_chain(libsym); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ plt.c:701:25: note: call to 'free' here 701 | free(libsym); | ^~~~~~~~~~~~

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