QEMU crashes with "-global driver=isa-fdc"
QEMU (current master branch at commit 935efca6) aborts when it is run like this:
qemu-system-x86_64 -global driver=isa-fdc qemu-system-x86_64: ../../devel/qemu/qapi/string-input-visitor.c:394: string_input_visitor_new: Assertion `str' failed. Aborted (core dumped)
Even if the command line is incomplete in that case, QEMU should not abort but rather print a proper error message instead.
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