x509-swoop Clean up empty buffer if no regsions was found.

And fix keyword A: and B: to not match in hex strings.

keywords.txt

@@ -1,3 +1,4 @@
+# -*- eval: (ethan-wspace-mode -1); -*-
 # openssl/crypto/x509/t_x509.c
 Certificate:
 Data:
@@ -157,8 +158,9 @@ EC-Parameters:
 GROUP:
 
 # eck_prn.c ECPKParameters_print
-A:
-B:
+# NOTE: There is SPC after these so that they are not matched in hex strings
+A: 
+B: 
 
 # openssl/crypto/x509v3/v3_bcons.c
 # X509V3_add_value_bool

x509-mode.el

@@ -1142,6 +1142,7 @@ Return view buffer on success."
           (setq buffer-read-only t)
           ;; Return buffer
           swoop-buffer)
+      (kill-buffer swoop-buffer)
       (message "No BEGIN/END regions found.")
       ;; Return nil
       nil)))