iplink_can: fix format output of clock with flag -details

The command
	ip -details link show can0
prints in the last line the value of the clock frequency attached
to the name of the following value "numtxqueues", e.g.
	clock 49500000numtxqueues 1 numrxqueues 1 gso_max_size
	 65536 gso_max_segs 65535

Add the missing space after the clock value.

Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>

ip/iplink_can.c

@@ -545,7 +545,7 @@ static void can_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 
 		print_int(PRINT_ANY,
 			  "clock",
-			  "\n	  clock %d",
+			  "\n	  clock %d ",
 			  clock->freq);
 	}