Fix compiler warning.

diff --git a/cups/tls-gnutls.c b/cups/tls-gnutls.c
index 7193d79457c199ec11bd49b9209d8e781ac353fa..3a2c4e43758be7ae985e9dfd8f2b5a49bbbc8121 100644 (file)
--- a/cups/tls-gnutls.c
+++ b/cups/tls-gnutls.c
@@ -1,7 +1,7 @@
 /*
  * TLS support code for CUPS using GNU TLS.
  *
- * Copyright 2007-2016 by Apple Inc.
+ * Copyright 2007-2017 by Apple Inc.
  * Copyright 1997-2007 by Easy Software Products, all rights reserved.
  *
  * These coded instructions, statements, and computer programs are the
@@ -397,7 +397,7 @@ httpCredentialsAreValidForName(
         for (i = 0; i < count; i ++)
        {
          rserial_size = sizeof(rserial);
-          if (!gnutls_x509_crl_get_crt_serial(tls_crl, i, rserial, &rserial_size, NULL) && cserial_size == rserial_size && !memcmp(cserial, rserial, rserial_size))
+          if (!gnutls_x509_crl_get_crt_serial(tls_crl, (unsigned)i, rserial, &rserial_size, NULL) && cserial_size == rserial_size && !memcmp(cserial, rserial, rserial_size))
          {
            result = 0;
            break;