Comment 2 for bug 1303276

StacktraceTop:
 __GI___libc_malloc (bytes=1024) at malloc.c:2885
 xmalloc (n=1024) at ../../util/memory.c:443
 md_copy (a=0x19f9980) at ../../cipher/md.c:249
 do_check_sig (c=c@entry=0x19fb990, node=node@entry=0x19fbce0, is_selfsig=is_selfsig@entry=0x0, is_expkey=is_expkey@entry=0x7fff85a70598, is_revkey=is_revkey@entry=0x7fff85a7059c) at ../../g10/mainproc.c:820
 check_sig_and_print (c=c@entry=0x19fb990, node=node@entry=0x19fbce0) at ../../g10/mainproc.c:1596