Make sure the absolute patch file is passed to the patch command.

According the patch(1) manpage:
The --directory option change to the directory dir immediately, before
doing anything else.

Thus if file is not relative to dir and making file absolute ensure that
patch will find it.

lib/ansible/modules/extras/files/patch.py

@@ -145,6 +145,9 @@ def main():
         module.fail_json(msg="patch command not found")
     patch_func = lambda opts: module.run_command("%s %s" % (patch_bin, ' '.join(opts)))
 
+    # patch need an absolute file name
+    p.src = os.path.abspath(p.src)
+    
     changed = False
     if not is_already_applied(patch_func, p.src, p.basedir, dest_file=p.dest, strip=p.strip):
         try: