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libjson: don't perform chartorune in getch() when char is null terminator, and remove empty string check added last commit

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

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

@@ -36,6 +36,8 @@

 		l->peeked = 0;

 		return r;

 	}

+	if(l->s[0] == '\0')

+		return 0;

 	l->s += chartorune(&r, l->s);

 	return r;

 }

@@ -318,11 +320,8 @@

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

 	l.s = s;

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

-		werrstr("empty string");

-		return nil;

-	}

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

+	l.slen = strlen(s);

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

 		return nil;

 	j = jsonobj(&l);

-- 

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