[PATCH] elf: Return false if output_section is NULL

[H.J. Lu]

Return false if output_section is NULL so that on input

https://sourceware.org/bugzilla/attachment.cgi?id=16131

objcopy generates

objcopy: /tmp/objcopy-poc(OrcError.cpp.o): invalid entry (0x22000000) in group [
3]
objcopy: /tmp/objcopy-poc(OrcError.cpp.o): invalid entry (0x21000000) in group [
3]
objcopy: /tmp/objcopy-poc(OrcError.cpp.o)(.text._ZNK12_GLOBAL__N_116OrcErrorCate
gory7messageB5cxx11Ei): relocation 29 has invalid symbol index 1160982879
objcopy: /tmp/stv73zYw/OrcError.cpp.o[.text._ZN4llvm3orc8orcErrorENS0_12OrcError
CodeE]: bad value

instead of

objcopy: /tmp/objcopy-poc(OrcError.cpp.o): invalid entry (0x22000000) in group [
3]
objcopy: /tmp/objcopy-poc(OrcError.cpp.o): invalid entry (0x21000000) in group [
3]
objcopy: /tmp/objcopy-poc(OrcError.cpp.o)(.text._ZNK12_GLOBAL__N_116OrcErrorCate
gory7messageB5cxx11Ei): relocation 29 has invalid symbol index 1160982879
Segmentation fault (core dumped)

PR binutils/33075
* elf.c (elf_map_symbols): Return false if output_section is
NULL.

-- 
H.J.
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