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kernel: fix off by one for $cputype buffer (thanks anthony martin)

--- a/sys/src/9/boot/boot.c

+++ b/sys/src/9/boot/boot.c

@@ -22,7 +22,7 @@

 	bind(root, "/", MAFTER);

 	buf[0] = '/';

-	buf[1+read(open("/env/cputype", OREAD|OCEXEC), buf+1, sizeof buf - 5)] = '\0';

+	buf[1+read(open("/env/cputype", OREAD|OCEXEC), buf+1, sizeof buf - 6)] = '\0';

 	strcat(buf, bin);

 	bind(buf, bin, MAFTER);

 	bind("/rc/bin", bin, MAFTER);