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troff: catch modulus by zero

From https://github.com/9fans/plan9port/pull/738

--- a/sys/src/cmd/troff/n4.c

+++ b/sys/src/cmd/troff/n4.c

@@ -452,7 +452,12 @@

 		i = ckph();

 		if (nonumb)

 			break;

-		acc %= i;

+		if (i == 0){

+			flusho();

+			ERROR "modulus by zero." WARN;

+			acc = 0;

+		} else

+			acc %= i;

 		goto a0;

 	case '&':	/*and*/

 		i = ckph();

-- 

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