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cpu: make -p work with explicit service in dialstring (same as import)

--- a/sys/src/cmd/cpu.c

+++ b/sys/src/cmd/cpu.c

@@ -783,7 +783,8 @@

 		buf[len] = '\0';

 		if((s = strrchr(buf, '!')) == nil)

 			fatal("filter: malformed remote port: %s", buf);

-		snprint(addr, sizeof(addr), "%s", netmkaddr(host, "tcp", s+1));

+		strecpy(addr, addr+sizeof(addr), netmkaddr(host, "tcp", s+1));

+		strecpy(strrchr(addr, '!'), addr+sizeof(addr), s);

 	}

 	snprint(buf, sizeof(buf), "%s", filterp);