[PATCH 13/47] dracut-module-setup.sh: rework kdump_get_ip_route_field

[Kairui Song]

Avoid duplicated echo / cut call, this make it easier to clean up code
in later commits.

Signed-off-by: Kairui Song 
---
 dracut-module-setup.sh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index 53abdc75..768026d3 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -523,9 +523,14 @@ kdump_get_ip_route()

kdump_get_ip_route_field()
 {
-    if `echo $1 | grep -q $2`; then
-        echo ${1##*$2} | cut -d ' ' -f1
+    local _str=$1
+
+    if [[ "$_str" == *" $2 "* ]]; then
+        _str="${_str##*$2 }"
+        _str="${_str%% *}"
     fi
+
+    echo "$_str"
 }

kdump_get_remote_ip()