Be consistent with the naming of the variable used to store the

function return value.  Previously, some code used "rval", some
used "ret".  This standardizes on "ret" and uses "rc" for temporary
return codes.

plugins/sample/sample_plugin.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010-2013 Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 2010-2016 Todd C. Miller <Todd.Miller@courtesan.com>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -445,7 +445,7 @@ static int
 io_log_output(const char *buf, unsigned int len)
 {
     const char *cp, *ep;
-    bool rval = true;
+    bool ret = true;
 
     ignore_result(fwrite(buf, len, 1, output));
     /*
@@ -455,11 +455,11 @@ io_log_output(const char *buf, unsigned int len)
      */
     for (cp = buf, ep = buf + len; cp < ep; cp++) {
 	if (cp + 5 < ep && memcmp(cp, "honk!", 5) == 0) {
-	    rval = false;
+	    ret = false;
 	    break;
 	}
     }
-    return rval;
+    return ret;
 }
 
 __dso_public struct policy_plugin sample_policy = {