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null terminate await buffer for proper tokenize call

--- a/sys/src/cmd/awk/run.c

+++ b/sys/src/cmd/awk/run.c

@@ -63,7 +63,7 @@

 system(const char *s)

 {

 	char status[512], *statfld[5];

-	int w, pid;

+	int n, pid;

 	if(!s)

 		return 1; /* a command interpreter is available */

@@ -76,8 +76,9 @@

 		return -1;

 	}

 	for(;;) {

-		w = await(status, sizeof(status) - 1);

-		if(w == -1)

+		n = await(status, sizeof(status) - 1);

+		status[n] = '\0';

+		if(n == -1)

 			return -1;

 		tokenize(status, statfld, nelem(statfld));

 		if(strtol(statfld[0], nil, 0) == pid)

-- 

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