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libjson: check for empty string in jsonparse()

--- a/sys/src/libjson/json.c

+++ b/sys/src/libjson/json.c

@@ -318,7 +318,10 @@

 	memset(&l, 0, sizeof(l));

 	l.s = s;

-	l.slen = strlen(s)+1;

+	if((l.slen = strlen(s)) == 0){

+		werrstr("empty string");

+		return nil;

+	}

 	if((l.buf = mallocz(l.slen, 1)) == nil)

 		return nil;

-- 

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