Fix whitespace in uapi/linux/tcp.h.

List of things fixed:
  - Two of the socket options were idented with spaces instead of tabs.
  - Trailing whitespace in some lines.
  - Improper spacing around parenthesis caught by checkpatch.pl.
  - Mix of space and tabs in tcp_word_hdr union.
Signed-off-by: Danilo Carvalho <doak@google.com>
Link: https://lore.kernel.org/r/20210108222104.2079472-1-doak@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/uapi/linux/tcp.h

@@ -67,7 +67,7 @@ union tcp_word_hdr {
 	__be32        words[5];
 };
 
-#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 
+#define tcp_flag_word(tp) (((union tcp_word_hdr *)(tp))->words[3])
 
 enum {
 	TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),