net: mark read-only arrays as const

String literals are constant, and usually, we can also tag the array
of pointers const too, moving it to the .rodata section.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/rxrpc/ar-ack.c

@@ -20,7 +20,7 @@
 
 static unsigned rxrpc_ack_defer = 1;
 
-static const char *rxrpc_acks[] = {
+static const char *const rxrpc_acks[] = {
 	"---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL",
 	"-?-"
 };