No null check on info leads to segfault

[fourierules]

During a quick little test of wemu with one of my custom device table blobs i kept hitting a segfault here. Why I'm getting here I'm not certain yet but the fact is everywhere else in the function info is guarded except here. Thought I'd bring it up...

qemu/hw/core/fdt_generic_util.c

Line 764 in 23b643b

 sprintf(info, "%s", error_get_pretty(errp));