dracut-module-setup: _dev to be a local variable

In kdump_setup_bridge/bond/team(), we use _dev as a global variable.
That causes following issues when network is br0 over bond0:

-> kdump_setup_bridge br0: _dev to be "bond0" as a brif
  -> kdump_setup_bond bond0: _dev is modified to be eth0 as a bond slave
    -> (jump back) kdump_setup_bridge br0: we really need _dev is
       "bond0" not "eth0".

_dev must be a local variable because it has been used multiple places.

Signed-off-by: WANG Chao <chaowang@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>

dracut-module-setup.sh

@@ -96,7 +96,7 @@ kdump_get_perm_addr() {
 
 kdump_setup_bridge() {
     local _netdev=$1
-    local _brif=""
+    local _brif _dev
     for _dev in `ls /sys/class/net/$_netdev/brif/`; do
         if kdump_is_bond "$_dev"; then
             kdump_setup_bond "$_dev"
@@ -114,6 +114,7 @@ kdump_setup_bridge() {
 
 kdump_setup_bond() {
     local _netdev=$1
+    local _dev
     for _dev in `cat /sys/class/net/$_netdev/bonding/slaves`; do
         echo -n " ifname=$_dev:$(kdump_get_perm_addr $_dev)" >> ${initdir}/etc/cmdline.d/42bond.conf
     done
@@ -126,7 +127,7 @@ kdump_setup_bond() {
 
 kdump_setup_team() {
     local _netdev=$1
-    local slaves=""
+    local slaves _dev
     for _dev in `teamnl $_netdev ports | awk -F':' '{print $2}'`; do
         echo -n " ifname=$_dev:$(kdump_get_perm_addr $_dev)" >> ${initdir}/etc/cmdline.d/44team.conf
         slaves+="$_dev,"