setlocale() sets errno to ENOENT ...

open("/usr/lib/locale/de_DE.UTF-8/LC_NUMERIC", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/de_DE.utf8/LC_NUMERIC", O_RDONLY|O_CLOEXEC) = 3

and this causes a problem later on (bsc#908516)

---
 free.c |    5 +++++
 1 file changed, 5 insertions(+)

--- free.c
+++ free.c	2018-04-04 12:47:06.360757839 +0000
@@ -197,6 +197,7 @@ int main(int argc, char **argv)
 {
 	int c, flags = 0, unit_set = 0;
 	struct commandline_arguments args;
+	int errsv;
 
 	/*
 	 * For long options that have no equivalent short option, use a
@@ -247,10 +248,12 @@ int main(int argc, char **argv)
 #ifdef HAVE_PROGRAM_INVOCATION_NAME
 	program_invocation_name = program_invocation_short_name;
 #endif
+	errsv = errno;
 	setlocale (LC_ALL, "");
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);
 	atexit(close_stdout);
+	errno = errsv;
 
 	while ((c = getopt_long(argc, argv, "bkmghltCc:ws:V", longopts, NULL)) != -1)
 		switch (c) {
@@ -317,11 +320,13 @@ int main(int argc, char **argv)
 			break;
 		case 's':
 			flags |= FREE_REPEAT;
+			errsv = errno;
 			errno = 0;
             args.repeat_interval = (1000000 * strtod_nol_or_err(optarg, "seconds argument failed"));
 			if (args.repeat_interval < 1)
 				xerrx(EXIT_FAILURE,
 				     _("seconds argument `%s' is not positive number"), optarg);
+			errno = errsv;
 			break;
 		case 'c':
 			flags |= FREE_REPEAT;