This patch ensure that e_shentsize (sections header's size in bytes) is

This patch ensure that e_shentsize (sections header's size in bytes) is
big enough to fill at least one Elf_Shdr.

While here, inverts calloc() arguments to be calloc(nmemb, size),
according to fread() call after.

This problem was found with afl, with e_shentsize=1.

ok miod@