virLogHostnameString: Don't leak hostname
Once @hostname is printed into @hoststr we don't need it anymore. ==6879== 5 bytes in 1 blocks are definitely lost in loss record 10 of 1,064 ==6879== at 0x4C29F80: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==6879== by 0xA7ED599: strdup (in /lib64/libc-2.21.so) ==6879== by 0x552C126: virStrdup (virstring.c:726) ==6879== by 0x553B13E: virGetHostnameImpl (virutil.c:720) ==6879== by 0x553B1BF: virGetHostnameQuiet (virutil.c:741) ==6879== by 0x54FA3FD: virLogHostnameString (virlog.c:462) ==6879== by 0x54FAB0F: virLogVMessage (virlog.c:645) ==6879== by 0x54FA680: virLogMessage (virlog.c:531) ==6879== by 0x54FBBF4: virLogParseOutputs (virlog.c:1130) ==6879== by 0x11CB4F: daemonSetupLogging (libvirtd.c:685) ==6879== by 0x11E137: main (libvirtd.c:1297) Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
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