commit 5345db3c9be1a22ca19202035b881b951c2f0f9e
from: Hiltjo Posthuma <hiltjo@codemadness.org>
date: Sat Mar 17 12:48:10 2018 UTC

clipcopy: no need to check for free(NULL), set to NULL after free

commit - 7648697f711d5ae336af142e9cd464d943341b24
commit + 5345db3c9be1a22ca19202035b881b951c2f0f9e
blob - d0b26acf1b3be29aafaf82d3a888aacb4e35e6f9
blob + 12bc86b81cb03c663381965eddb664b3015884e6
--- x.c
+++ x.c
@@ -245,8 +245,8 @@ clipcopy(const Arg *dummy)
 {
 	Atom clipboard;
 
-	if (xsel.clipboard != NULL)
-		free(xsel.clipboard);
+	free(xsel.clipboard);
+	xsel.clipboard = NULL;
 
 	if (xsel.primary != NULL) {
 		xsel.clipboard = xstrdup(xsel.primary);