qemu-ga: fix segv after failure to open log file
Currently, if we fail to open the specified log file (generally due to a permissions issue), we'll assign NULL to the logfile handle (stderr, initially) used by the logging routines, which can cause a segfault to occur when we attempt to report the error before exiting. Instead, only re-assign if the open() was successful. Reviewed-by: NMichal Privoznik <mprivozn@redhat.com> Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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