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bcm: provide /dev/cputemp in a format stats can understand

--- a/sys/src/9/bcm/devarch.c

+++ b/sys/src/9/bcm/devarch.c

@@ -160,9 +160,9 @@

 static long

 cputempread(Chan*, void *a, long n, vlong offset)

 {

-	char str[16];

-

-	snprint(str, sizeof str, "%ud\n", (getcputemp()+500)/1000);

+	char str[32];

+	uint t = getcputemp();

+	snprint(str, sizeof str, "%ud.%ud\n", t/1000, t%1000);

 	return readstr(offset, a, n, str);

 }