PR26337, Malloc size error in objdump

PR26337, Malloc size error in objdump

A malloc failure triggered by a fuzzed object file isn't a real
problem unless objdump doesn't exit cleanly after the failure, which
it does.  However we have bfd_malloc_and_get_section to sanity check
size of uncompressed sections before allocating memory.  Use it.

	PR 26337
	* objdump.c (load_specific_debug_section): Don't malloc space for
	section contents, use bfd_malloc_and_get_section.