net: clean up empty lines in .c and .h files

newlib/libc/sys/rtems/include/net/if.h

@@ -164,7 +164,6 @@ struct if_data {
 #define	IFF_RENAMING	0x400000	/* (n) interface is being renamed */
 #define	IFF_NOGROUP	0x800000	/* (n) interface is not part of any groups */
 
-
 /*
  * Old names for driver flags so that user space tools can continue to use
  * the old (portable) names.

newlib/libc/sys/rtems/include/netinet/tcp.h

@@ -107,7 +107,6 @@ struct tcphdr {
 #define	MAX_SACK_BLKS	6	/* Max # SACK blocks stored at receiver side */
 #define	TCP_MAX_SACK	4	/* MAX # SACKs sent in any segment */
 
-
 /*
  * The default maximum segment size (MSS) to be used for new TCP connections
  * when path MTU discovery is not enabled.
@@ -282,7 +281,6 @@ struct tcphdr {
 #define TCP_SHARED_CWND_TIME_LIMIT 1128 /* we should limit to low time values the scwnd life */
 #define TCP_RACK_PROFILE 1129	/* Select a profile that sets multiple options */
 
-
 /* Start of reserved space for third-party user-settable options. */
 #define	TCP_VENDOR	SO_VENDOR