fnwrite(): call fclose() separately, found by Coverity Scan

If any of the fputs() calls fails we will not call fclose() and thus
cause resource loss.

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

src/util.c

@@ -105,9 +105,9 @@ int fnwrite(char *value, char *fmt, ...)
 		return -1;
 
 	/* echo(1) always adds a newline */
-	if (fputs(value, fp) == EOF ||
+	if (fputs(value, fp) == EOF || fputs("\n", fp) == EOF)
-	    fputs("\n", fp)  == EOF ||
+		rc = -1;
-	    fclose(fp)       == EOF)
+	if (fclose(fp) == EOF)
 		rc = -1;
 	else
 		rc = 0;