Filters: Removed FI_COMMA, not used for 19 years.

This instruction was removed in the commit linked below
and never used ever again. Rest in peace.

commit 84c7e1943f
Author: Pavel Machek <pavel@ucw.cz>
Date:   Tue Mar 2 19:49:28 1999 +0000

filter/filter.c

@@ -641,10 +641,6 @@ interpret(struct f_inst *what)
   for ( ; what; what = what->next) {
   res.type = T_VOID;
   switch(what->fi_code) {
-  case FI_COMMA:
-    TWOARGS;
-    break;
-
 /* Binary operators */
   case FI_ADD:
     TWOARGS_C;
@@ -1541,8 +1537,7 @@ i_same(struct f_inst *f1, struct f_inst *f2)
     return 1;
 
   switch(f1->fi_code) {
-  case FI_COMMA: /* fall through */
-  case FI_ADD:
+  case FI_ADD: /* fall through */
   case FI_SUBTRACT:
   case FI_MULTIPLY:
   case FI_DIVIDE:

filter/filter.h

@@ -18,7 +18,6 @@
 
 #define FI__TWOCHAR(a,b)	((a<<8) | b)
 #define FI__LIST \
-  F(FI_COMMA,			  0, ',') \
   F(FI_ADD,			  0, '+') \
   F(FI_SUBTRACT,		  0, '-') \
   F(FI_MULTIPLY,		  0, '*') \