Don't NUL terminate the enum spec in the enum spec writing function,

the function-emitting function will do that.

Spotted by:	Nils Goroll

lib/libvmod_std/vmod.py

@@ -141,7 +141,6 @@ def parse_enum(tq):
 			raise Exception("Duplicate Enum value '%s'" % i)
 		b[i] = True
 		s = s + i.strip() + '\\0'
-	s = s + '\\0'
 	return s
 
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