mozilla-certdata: Fix typo: sprintf, not snprintf, in awk.

Only used during import, and only in case something is wrong anyway
requiring manual intervention, so no change to builds.


(riastradh)

@@ -427,7 +427,7 @@
 			    NR, label
 		}
 		if (!(lolab in label_lineno)) {
-			err(snprintf("Missing label: %s", label))
+			err(sprintf("Missing label: %s", label))
 			skip()
 			next
 		}