remove redundant function declaration

Remove warning message from "gcc -Wredundant-decls" in
FreeRTOS_TCP_IP.c.

Signed-off-by: Florian La Roche <[email protected]>

Author: laroche

source/FreeRTOS_TCP_IP.c

@@ -87,14 +87,6 @@
     /* coverity[misra_c_2012_rule_8_9_violation] */
     _static FreeRTOS_Socket_t * xSocketToListen = NULL;
 
-    #if ( ipconfigHAS_DEBUG_PRINTF != 0 )
-
-/*
- * For logging and debugging: make a string showing the TCP flags.
- */
-        const char * prvTCPFlagMeaning( UBaseType_t xFlags );
-    #endif /* ipconfigHAS_DEBUG_PRINTF != 0 */
-
     static IPv46_Address_t xGetSourceAddrFromBuffer( const uint8_t * const pucEthernetBuffer );
 
 /*-----------------------------------------------------------*/