core/utils: drop meaningless const from return value of osmo_luhn()
Change-Id: I085da06f31a0a6862ae2ba041fafc134cc240f7e
diff --git a/include/osmocom/core/utils.h b/include/osmocom/core/utils.h
index f27359c..f429ba6 100644
--- a/include/osmocom/core/utils.h
+++ b/include/osmocom/core/utils.h
@@ -155,7 +155,7 @@
uint32_t osmo_isqrt32(uint32_t x);
-const char osmo_luhn(const char* in, int in_len);
+char osmo_luhn(const char* in, int in_len);
/*! State for OSMO_STRBUF_APPEND() and OSMO_STRBUF_PRINTF(). See there for examples. */
struct osmo_strbuf {