Fix a leak in match_dyn, spotted by Greg Bock.

Closes #2

src/vmod_re.c

@@ -270,6 +270,7 @@ vmod_match_dyn(VRT_CTX, struct vmod_priv *task, VCL_STRING pattern,
 	vre_t *vre;
 	int erroffset;
 	const char *error;
+	VCL_BOOL dyn_return;
 
 	AN(pattern);
 	AN(task);
@@ -282,7 +283,9 @@ vmod_match_dyn(VRT_CTX, struct vmod_priv *task, VCL_STRING pattern,
 		     pattern, error, erroffset);
 		return 0;
 	}
-	return match(ctx, vre, subject, task);
+	dyn_return = match(ctx, vre, subject, task);
+	VRE_free(&vre);
+	return dyn_return;
 }
 
 VCL_STRING