tempfile(): use same fallback also when O_TMPFILE is missing

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/tempfile.c

@@ -29,6 +29,18 @@
 #include <stdlib.h>		/* mkostemp() */
 #include <sys/stat.h>		/* umask() */
 
+static FILE *fallback(void)
+{
+	char nm[15] = _PATH_TMP "XXXXXXXX";
+	int fd;
+
+	fd = mkostemp(nm, O_CLOEXEC);
+	if (-1 == fd)
+		return NULL;
+
+	return fdopen(fd, "w+");
+}
+
 /**
  * A secure tmpfile() replacement
  *
@@ -54,19 +66,15 @@ FILE *tempfile(void)
 	fd = open(_PATH_TMP, O_TMPFILE | O_RDWR | O_EXCL | O_CLOEXEC, S_IRUSR | S_IWUSR);
 	umask(oldmask);
 	if (-1 == fd) {
-		if (errno == EOPNOTSUPP) {
-			char nm[15] = _PATH_TMP "XXXXXXXX";
+		if (errno == EOPNOTSUPP)
+			return fallback();
 
-			fd = mkostemp(nm, O_CLOEXEC);
-			if (-1 == fd)
-				return NULL;
-		} else
-			return NULL;
+		return NULL;
 	}
 
 	return fdopen(fd, "w+");
 #else
-	return tmpfile(); /* Fallback on older GLIBC/Linux and actual UNIX systems */
+	return fallback();
 #endif
 }