vl.c: Fix broken -usb option
Commit 094b287f0b accidentally broke the "-usb" command line
option, so it would have no effect if the user had not specified
any machine options at that point. (the return value from
'qemu_opts_find(qemu_find_opts("machine"), 0);' is NULL if there
are no user specified options, so it is only to be used for
looking up an option, not when trying to set one.) Similarly,
would '-usbdevice' no longer cause USB to default to enabled.
Fix this regression by using the same style of code for forcing
the usb=on machine option that we use for other aliases such as
'-enable-kvm'.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
			
			
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							@ -3273,16 +3273,12 @@ int main(int argc, char **argv, char **envp)
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                break;
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					                break;
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            }
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					            }
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            case QEMU_OPTION_usb:
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					            case QEMU_OPTION_usb:
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                machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
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					                olist = qemu_find_opts("machine");
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                if (machine_opts) {
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					                qemu_opts_parse(olist, "usb=on", 0);
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                    qemu_opt_set_bool(machine_opts, "usb", true);
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                }
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                break;
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					                break;
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            case QEMU_OPTION_usbdevice:
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					            case QEMU_OPTION_usbdevice:
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                machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
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					                olist = qemu_find_opts("machine");
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                if (machine_opts) {
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					                qemu_opts_parse(olist, "usb=on", 0);
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                    qemu_opt_set_bool(machine_opts, "usb", true);
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                }
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                add_device_config(DEV_USB, optarg);
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					                add_device_config(DEV_USB, optarg);
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                break;
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					                break;
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            case QEMU_OPTION_device:
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					            case QEMU_OPTION_device:
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