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libc: use Runemax instead of hardcoded 0x65536 for fmtchar check (thanks qrstuv)

--- a/sys/src/ape/lib/fmt/fmt.c

+++ b/sys/src/ape/lib/fmt/fmt.c

@@ -80,7 +80,7 @@

 {

 	Convfmt *p, *ep;

-	if(c<=0 || c>=65536)

+	if(c<=0 || c>Runemax)

 		return -1;

 	if(!f)

 		f = __badfmt;

--- a/sys/src/libc/fmt/fmt.c

+++ b/sys/src/libc/fmt/fmt.c

@@ -61,7 +61,7 @@

 {

 	Convfmt *p, *ep;

-	if(c<=0 || c>=65536)

+	if(c<=0 || c>Runemax)

 		return -1;

 	if(!f)

 		f = _badfmt;