'read -d' is a bash extension and doesn't work in POSIX shells.
For example 'checkpatches.sh' doesn't work properly on ubuntu,
where 'dash' is a default shell:

  ./devtools/checkpatches.sh: 52: read: Illegal option -d

Let's use single quotes instead of variable.

Fixes: 7413e7f2aeb3 ("devtools: alert on new calls to exit from libs")
CC: sta...@dpdk.org

Signed-off-by: Ilya Maximets <i.maxim...@samsung.com>
---
 devtools/checkpatches.sh | 34 ++++++++++++++++------------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/devtools/checkpatches.sh b/devtools/checkpatches.sh
index ba795ad1d..aad35275c 100755
--- a/devtools/checkpatches.sh
+++ b/devtools/checkpatches.sh
@@ -44,12 +44,18 @@ print_usage () {
 }
 
 check_forbidden_additions() {
-    # This awk script receives a list of expressions to monitor
-    # and a list of folders to search these expressions in
-    # - No search is done inside comments
-    # - Both additions and removals of the expressions are checked
-    #   A positive balance of additions fails the check
-       read -d '' awk_script << 'EOF'
+       # This awk script receives a list of expressions to monitor
+       # and a list of folders to search these expressions in
+       # - No search is done inside comments
+       # - Both additions and removals of the expressions are checked
+       #   A positive balance of additions fails the check
+       # ---------------------------------
+       # refrain from new additions of rte_panic() and rte_exit()
+       # multiple folders and expressions are separated by spaces
+       awk -v FOLDERS="lib drivers" \
+               -v EXPRESSIONS="rte_panic\\\( rte_exit\\\(" \
+               -v RET_ON_FAIL=1 \
+       '
        BEGIN {
                split(FOLDERS,deny_folders," ");
                split(EXPRESSIONS,deny_expr," ");
@@ -70,7 +76,7 @@ check_forbidden_additions() {
                # non comment code
                if (in_comment == 0) {
                        for (i in deny_expr) {
-                               forbidden_added = "^\+.*" deny_expr[i];
+                               forbidden_added = "^+.*" deny_expr[i];
                                forbidden_removed="^-.*" deny_expr[i];
                                current = expressions[deny_expr[i]]
                                if ($0 ~ forbidden_added) {
@@ -90,13 +96,13 @@ check_forbidden_additions() {
        }
        # switch to next file , check if the balance of add/remove
        # of previous filehad new additions
-       ($0 ~ "^\+\+\+ b/") {
+       ($0 ~ "^+++ b/") {
                in_file = 0;
                if (count > 0) {
                        exit;
                }
                for (i in deny_folders) {
-                       re = "^\+\+\+ b/" deny_folders[i];
+                       re = "^+++ b/" deny_folders[i];
                        if ($0 ~ deny_folders[i]) {
                                in_file = 1
                                last_file = $0
@@ -114,15 +120,7 @@ check_forbidden_additions() {
                        }
                        exit RET_ON_FAIL
                }
-       }
-EOF
-       # ---------------------------------
-       # refrain from new additions of rte_panic() and rte_exit()
-       # multiple folders and expressions are separated by spaces
-       awk -v FOLDERS="lib drivers" \
-               -v EXPRESSIONS="rte_panic\\\( rte_exit\\\(" \
-               -v RET_ON_FAIL=1 \
-               "$awk_script" -
+       }' -
 }
 
 number=0
-- 
2.17.1

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