Revert "Try alternative to xargs in validate.sh"

This reverts commit 1bc10a9.

tools/validate.sh

@@ -1,13 +1,3 @@
 #!/bin/bash
 
-exit_code=0
-
-find 'functions/' -name "*.yaml" -type f | while read -r file; do
-    tools/yajsv -s schemas/function.yaml "$file"
-
-    if [ $? -ne 0 ]; then
-        exit_code=1
-    fi
-done
-
-exit $exit_code
+find 'functions/' -name '*.yaml' -type f -print0 | xargs -0 -I {} tools/yajsv -s schemas/function.yaml {}