hack/validate/vendor: shellcheck fixes

The export statement is definitely not needed. The rest is obvious.

> In hack/validate/vendor line 3:
> export SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
>        ^-- SC2155: Declare and assign separately to avoid masking return values.
>
>
> In hack/validate/vendor line 43:
>	if ls -d vendor/$f  > /dev/null 2>&1; then
>                       ^-- SC2086: Double quote to prevent globbing and word splitting.
>
>
> In hack/validate/vendor line 44:
> 		found=$(find vendor/$f -iregex '.*LICENSE.*' -or -iregex '.*COPYRIGHT.*' -or -iregex '.*COPYING.*' | wc -l)
>                                   ^-- SC2086: Double quote to prevent globbing and word splitting.
>
>
> In hack/validate/vendor line 45:
>		if [ $found -eq 0 ]; then
>                    ^-- SC2086: Double quote to prevent globbing and word splitting.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

hack/validate/vendor

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-export SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 source "${SCRIPTDIR}/.validate"
 
 validate_vendor_diff(){
@@ -40,9 +40,9 @@ validate_vendor_diff(){
 validate_vendor_used() {
 	pkgs=$(mawk '/^[a-zA-Z0-9]/ { print $1 }' < vendor.conf)
 	for f in $pkgs; do
-	if ls -d vendor/$f  > /dev/null 2>&1; then
-		found=$(find vendor/$f -iregex '.*LICENSE.*' -or -iregex '.*COPYRIGHT.*' -or -iregex '.*COPYING.*' | wc -l)
-		if [ $found -eq 0 ]; then
+	if ls -d "vendor/$f"  > /dev/null 2>&1; then
+		found=$(find "vendor/$f" -iregex '.*LICENSE.*' -or -iregex '.*COPYRIGHT.*' -or -iregex '.*COPYING.*' | wc -l)
+		if [ "$found" -eq 0 ]; then
 		echo "WARNING: could not find copyright information for $f"
 		fi
 	else