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grep: error if sbrk fails

--- a/sys/src/cmd/grep/sub.c

+++ b/sys/src/cmd/grep/sub.c

@@ -11,10 +11,14 @@

 	if(m < n) {

 		if(n > Nhunk) {

 			v = sbrk(n);

+			if(v == (void*)-1)

+				error("sbrk");

 			memset(v, 0, n);

 			return v;

 		}

 		s = sbrk(Nhunk);

+		if(s == (void*)-1)

+			error("sbrk");

 		m = Nhunk;

 	}

 	v = s;

-- 

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