[mobile-broadband-provider-info: 2/4] build: reject and whitespace in XML via unit test

[Thomas Haller <thaller src gnome org>]

commit 684ed297a7fd01ae2ee0e37d489bc8fbc9178fb9
Author: Thomas Haller <thaller redhat com>
Date:   Wed Sep 7 13:59:10 2022 +0200

    build: reject and whitespace in XML via unit test
    
    Note only reject a whitespace right before "<", but also
    in between tabs.

 Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Makefile.am b/Makefile.am
index 8126a0e..9de5196 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -18,5 +18,5 @@ apns-conf.xml: $(top_srcdir)/apns-conf.xsl $(top_srcdir)/$(SP_XML_DB)
 pkgdata_DATA = apns-conf.xml
 
 check-local:
-       grep '^[[:blank:]]* <\|[[:blank:]]$$' serviceproviders.xml && exit 1 || :
+       grep '^[[:blank:]]* [[:blank:]]*<\|[[:blank:]]$$' serviceproviders.xml && exit 1 || :
        xmllint --valid $(top_srcdir)/$(SP_XML_DB) 2>&1 >/dev/null