asan: heap-buffer-overflow objdump.c:3299 in disassemble_bytes

Fix yet another crash, this one with a fuzzed function symbol size.
The patch also corrects objdump behaviour when both --disassemble=sym
and --stop-address=value are given.  Previously --disassemble=sym
overrode --stop-address, now we take the lower of the stop-address
value and the end of function.

	* objdump.c (disassemble_section): Sanity check ELF st_size.