xtables: remove unnecessary cast

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/xtables.c b/xtables.c
index ed082f3..47a0d9c 100644
--- a/xtables.c
+++ b/xtables.c
@@ -285,7 +285,7 @@
 	if (procfile < 0)
 		return NULL;
 
-	ret = (char *) malloc(PROCFILE_BUFSIZ);
+	ret = malloc(PROCFILE_BUFSIZ);
 	if (ret) {
 		memset(ret, 0, PROCFILE_BUFSIZ);
 		switch (read(procfile, ret, PROCFILE_BUFSIZ)) {