vl.c: Fix Coverity complaining for vmstate_dump_file
commit abfd9ce3(migration: dump vmstate info as a json file for static analysis) introduce a new command, '-dump-vmstate', that takes a filename as an argument. When executed, QEMU will dump the vmstate information for the machine type it's invoked with to the file, and quit. However, only one instance of the -dump-vmstate option is supported. If more were given, the vmstate_dump_file variable would be overwritten. This fix also helps silence a Coverity error. Signed-off-by: NGonglei <arei.gonglei@huawei.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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