cmdFreepages: initialize @tmp

In the 404bac14 the @tmp variable was introduced. It's purpose is to
avoid typecasting when parsing --pagesize argument. However, if the
argument is not presented, tmp may be used uninitialized resulting in
bogus virNodeGetFreePages() API call:

virsh freepages --cellno 2
error: Failed to open file '/sys/devices/system/node/node2/hugepages/hugepages-4294967295kB/free_hugepages': No such file or directory
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

tools/virsh-host.c

@@ -229,7 +229,7 @@ cmdFreepages(vshControl *ctl, const vshCmd *cmd)
     bool ret = false;
     unsigned int npages;
     unsigned int *pagesize = NULL;
-    unsigned long long tmp;
+    unsigned long long tmp = 0;
     int cell;
     unsigned long long *counts = NULL;
     size_t i, j;