Fix indentation.

Author: squidarth

src/packet/Makefile.am

@@ -7,6 +7,6 @@ libpacket_a_SOURCES = packetshell.hh packetshell.cc queued_packet.hh \
                       abstract_packet_queue.hh dropping_packet_queue.hh dropping_packet_queue.cc infinite_packet_queue.hh \
                       drop_tail_packet_queue.hh drop_head_packet_queue.hh \
                       codel_packet_queue.cc codel_packet_queue.hh \
-		       red_packet_queue.cc red_packet_queue.hh \
+		        red_packet_queue.cc red_packet_queue.hh \
                       pie_packet_queue.cc pie_packet_queue.hh \
                       bindworkaround.hh