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plumber: fix substrings in match rules

Unmatched substrings are nil, so we can't rely on nil terminating the
array of substrings.

--- a/sys/src/cmd/plumb/match.c

+++ b/sys/src/cmd/plumb/match.c

@@ -36,12 +36,13 @@

 		free(match[i]);

 		match[i] = nil;

 	}

-	for(i=0; i<10 && rs[i].sp!=nil; i++){

-		n = rs[i].ep-rs[i].sp;

-		match[i] = emalloc(n+1);

-		memmove(match[i], rs[i].sp, n);

-		match[i][n] = '\0';

-	}

+	for(i=0; i<10; i++)

+		if(rs[i].sp!=nil){

+			n = rs[i].ep-rs[i].sp;

+			match[i] = emalloc(n+1);

+			memmove(match[i], rs[i].sp, n);

+			match[i][n] = '\0';

+		}

 }

 int

-- 

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