Update util/ck_errf.pl script, and have it run automatically
during "make errors" and thus during "make update".

Fix lots of bugs that util/ck_errf.pl can detect automatically.
Various others of these are still left to fix; that's why
"make update" will complain loudly when run now.
diff --git a/engines/e_cswift.c b/engines/e_cswift.c
index 0f9c1b2..f86c057 100644
--- a/engines/e_cswift.c
+++ b/engines/e_cswift.c
@@ -943,7 +943,7 @@
 
 	if (!get_context(&hac))
 	{
-		CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_UNIT_FAILURE);
+		CSWIFTerr(CSWIFT_F_CSWIFT_RAND_BYTES, CSWIFT_R_UNIT_FAILURE);
 		goto err;
 	}
 	acquired = 1;
@@ -963,7 +963,7 @@
 		if (swrc != SW_OK)
 		{
 			char tmpbuf[20];
-			CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_REQUEST_FAILED);
+			CSWIFTerr(CSWIFT_F_CSWIFT_RAND_BYTES, CSWIFT_R_REQUEST_FAILED);
 			sprintf(tmpbuf, "%ld", swrc);
 			ERR_add_error_data(2, "CryptoSwift error number is ", tmpbuf);
 			goto err;