Fix building with -Og

When building using -Og, gcc sees that some variables can be used
uninitialized  It can be debatable whether it is possible with our
codeflow, but functions should be self-contained and initializations are
always good.  The return instead of goto is due to actualType being used
in the cleanup.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>
(cherry picked from commit 3470cd86)

src/lxc/lxc_driver.c

@@ -4190,7 +4190,7 @@ lxcDomainAttachDeviceNetLive(virConnectPtr conn,
     if (!priv->initpid) {
         virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                        _("Cannot attach disk until init PID is known"));
-        goto cleanup;
+        return -1;
     }
 
     /* preallocate new slot for device */

src/nwfilter/nwfilter_ebiptables_driver.c

@@ -1570,7 +1570,7 @@ iptablesCreateRuleInstanceStateCtrl(virFirewallPtr fw,
                                     const char *ifname,
                                     virNWFilterVarCombIterPtr vars)
 {
-    int rc;
+    int rc = 0;
     bool directionIn = false;
     char chainPrefix[2];
     bool maySkipICMP, inout = false;

src/util/virbitmap.c

@@ -724,7 +724,7 @@ virBitmapLastSetBit(virBitmapPtr bitmap)
     ssize_t i;
     int unusedBits;
     ssize_t sz;
-    unsigned long bits;
+    unsigned long bits = 0;
 
     unusedBits = bitmap->map_len * VIR_BITMAP_BITS_PER_UNIT - bitmap->max_bit;