[sms] Fix compile warning by including gsm_data.h
In file included from sms_test.c:27:
../../include/openbsc/gsm_utils.h:33: warning: `enum gsm_band' declared inside parameter list
../../include/openbsc/gsm_utils.h:33: warning: its scope is only this definition or declaration, which is probably not what you want
../../include/openbsc/gsm_utils.h:34: warning: `enum gsm_band' declared inside parameter list
diff --git a/openbsc/tests/sms/sms_test.c b/openbsc/tests/sms/sms_test.c
index fa09636..2ce2cc6 100644
--- a/openbsc/tests/sms/sms_test.c
+++ b/openbsc/tests/sms/sms_test.c
@@ -24,6 +24,7 @@
#include <sys/types.h>
#include <openbsc/debug.h>
#include <openbsc/msgb.h>
+#include <openbsc/gsm_data.h>
#include <openbsc/gsm_utils.h>
int main(int argc, char** argv)