vl.c: Error locations for options using add_device_config()
These are -bt, -serial, -virtcon, -parallel, -debugcon, -usbdevice. Improves messages emitted via proper error reporting interfaces. For instance: $ qemu-system-x86_64 -nodefaults -S -usb -usbdevice net:vlan=xxx qemu-system-x86_64: Parameter 'vlan' expects a number becomes: qemu-system-x86_64: -usbdevice net:vlan=xxx: Parameter 'vlan' expects a number Many more remain unimproved, because they're fprintf()ed. The next few commits will take care of that. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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