[PATCH] devtools: fix awk regular expression

[Stephen Hemminger]

The latest version of awk (in Debian testing) will give a warning
about invalid regular expression error.

        awk: line 6: regular expression compile failed (syntax error ^* or ^+)
        ^+++ b/

Fix by using additional backslash escape.

Signed-off-by: Stephen Hemminger <step...@networkplumber.org>
---
 devtools/checkpatches.sh | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/devtools/checkpatches.sh b/devtools/checkpatches.sh
index 9fb8fd0a07..646d5d1513 100755
--- a/devtools/checkpatches.sh
+++ b/devtools/checkpatches.sh
@@ -320,10 +320,10 @@ check_experimental_tags() { # <patch>
                current_file = "";
                ret = 0;
        }
-       /^+++ b\// {
+       /^\+++ b\// {
                current_file = $2;
        }
-       /^+.*__rte_experimental/ {
+       /^\+.*__rte_experimental/ {
                if (current_file ~ ".c$" ) {
                        print "Please only put __rte_experimental tags in " \
                                "headers ("current_file")";
@@ -350,10 +350,10 @@ check_internal_tags() { # <patch>
                current_file = "";
                ret = 0;
        }
-       /^+++ b\// {
+       /^\+++ b\// {
                current_file = $2;
        }
-       /^+.*__rte_internal/ {
+       /^\+.*__rte_internal/ {
                if (current_file ~ ".c$" ) {
                        print "Please only put __rte_internal tags in " \
                                "headers ("current_file")";
-- 
2.51.0