str: Add function xstrdup_if_nonnull() and introduce many users.

[pspp] / src / data / format.c

diff --git a/src/data/format.c b/src/data/format.c
index a25e08f62b4d381e7b9490bc74ffe1dc27ebec85..a4c52b788ebd811541b9e3ac7d0e25beab016d81 100644 (file)
--- a/src/data/format.c
+++ b/src/data/format.c
@@ -1157,7 +1157,7 @@ static struct fmt_affix
 fmt_affix_clone (const struct fmt_affix *old)
 {
   return (struct fmt_affix) {
-    .s = old->s ? xstrdup (old->s) : NULL,
+    .s = xstrdup_if_nonnull (old->s),
     .width = old->width,
   };
 }