misc: Fix warnings about size of size_t in printf
Fixes warnings like:
warning: format '%d' expects argument of type 'int', but argument 3 has type 'long int' [-Wformat]
diff --git a/openbsc/src/gprs/gprs_gsup_messages.c b/openbsc/src/gprs/gprs_gsup_messages.c
index 8996fe2..9d9b6be 100644
--- a/openbsc/src/gprs/gprs_gsup_messages.c
+++ b/openbsc/src/gprs/gprs_gsup_messages.c
@@ -153,7 +153,7 @@
parse_error:
LOGP(DGPRS, LOGL_ERROR,
- "GSUP IE type %d, length %d invalid in PDP info\n", iei, value_len);
+ "GSUP IE type %d, length %zu invalid in PDP info\n", iei, value_len);
return -1;
}