virLogHostnameString: Don't leak hostname
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: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

taget/libvirt,zippy2/libvirt,libvirt/libvirt,eskultety/libvirt,taget/libvirt,nertpinx/libvirt,rlaager/libvirt,olafhering/libvirt,jardasgit/libvirt,andreabolognani/libvirt,jfehlig/libvirt,zippy2/libvirt,eskultety/libvirt,eskultety/libvirt,zippy2/libvirt,datto/libvirt,eskultety/libvirt,datto/libvirt,libvirt/libvirt,rlaager/libvirt,nertpinx/libvirt,crobinso/libvirt,jardasgit/libvirt,datto/libvirt,crobinso/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,crobinso/libvirt,nertpinx/libvirt,jfehlig/libvirt,taget/libvirt,nertpinx/libvirt,zippy2/libvirt,rlaager/libvirt,jfehlig/libvirt,jfehlig/libvirt,eskultety/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,datto/libvirt,rlaager/libvirt,andreabolognani/libvirt,datto/libvirt,rlaager/libvirt,andreabolognani/libvirt,crobinso/libvirt,jardasgit/libvirt,libvirt/libvirt,olafhering/libvirt,taget/libvirt,taget/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,olafhering/libvirt,libvirt/libvirt,andreabolognani/libvirt,olafhering/libvirt