Treat input on the snp device as an `unsigned char'. According to the

submitter, this permits Russian (and probably other locales') characters
to be entered via watch(8).

PR:		35636
Submitted by:	Gleb Smirnoff <glebius@rinet.ru>

sys/dev/snp/snp.c

@@ -202,7 +202,7 @@ snpwrite(dev, uio, flag)
 	struct snoop *snp;
 	struct tty *tp;
 	int error, i, len;
-	char c[SNP_INPUT_BUF];
+	unsigned char c[SNP_INPUT_BUF];
 
 	snp = dev->si_drv1;
 	tp = snp->snp_tty;