Merge pull request #3485 from grondo/issue#3482

job-manager: fix compilation error on gcc-10

Author: mergify[bot]

src/modules/job-manager/jobtap.c

@@ -421,7 +421,9 @@ int jobtap_load (struct jobtap *jobtap,
     return 0;
 error:
     if (errp && errp->text[0] == '\0')
-        strncpy (errp->text, flux_plugin_strerror (p), sizeof (errp->text));
+        strncpy (errp->text,
+                 flux_plugin_strerror (p),
+                 sizeof (errp->text) - 1);
     flux_plugin_destroy (p);
     return -1;
 }