[ostree] gpg: Use gpg_strerror_r for threadsafety

[Colin Walters <walters src gnome org>]

commit f461c02bb55bf2853a3b81ed5c8618040ab54e98
Author: Colin Walters <walters verbum org>
Date:   Mon Feb 22 16:50:28 2016 -0500

    gpg: Use gpg_strerror_r for threadsafety
    
    These APIs are rather painful...this is why GError exists.

 src/libotutil/ot-gpg-utils.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/src/libotutil/ot-gpg-utils.c b/src/libotutil/ot-gpg-utils.c
index aa5b481..9414088 100644
--- a/src/libotutil/ot-gpg-utils.c
+++ b/src/libotutil/ot-gpg-utils.c
@@ -31,6 +31,7 @@ ot_gpgme_error_to_gio_error (gpgme_error_t   gpg_error,
                              GError        **error)
 {
   GIOErrorEnum errcode;
+  char errbuf[1024];
 
   /* XXX This list is incomplete.  Add cases as needed. */
 
@@ -42,9 +43,11 @@ ot_gpgme_error_to_gio_error (gpgme_error_t   gpg_error,
 
       /* special case - abort on out-of-memory */
       case GPG_ERR_ENOMEM:
+        (void) gpg_strerror_r (gpg_error, errbuf, sizeof (errbuf));
+        errbuf[sizeof(errbuf)-1] = '\0';
         g_error ("%s: %s",
                  gpgme_strsource (gpg_error),
-                 gpgme_strerror (gpg_error));
+                 errbuf);
 
       case GPG_ERR_INV_VALUE:
         errcode = G_IO_ERROR_INVALID_ARGUMENT;
@@ -55,9 +58,11 @@ ot_gpgme_error_to_gio_error (gpgme_error_t   gpg_error,
         break;
     }
 
+  (void) gpg_strerror_r (gpg_error, errbuf, sizeof (errbuf));
+  errbuf[sizeof(errbuf)-1] = '\0';
   g_set_error (error, G_IO_ERROR, errcode, "%s: %s",
                gpgme_strsource (gpg_error),
-               gpgme_strerror (gpg_error));
+               errbuf);
 }
 
 gboolean