0ee5a0e Add NULL bfd test to elf_symbol_from

Authored and Committed by Alan Modra 6 years ago
    Add NULL bfd test to elf_symbol_from
    
    A followup to PR22443.
    
    	* elf-bfd.h (elf_symbol_from): Check for NULL symbol bfd.
    	* elfcode.h (elf_slurp_reloc_table_from_section): Add FIXME comment.
    
        
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