fix some warnings (-Wdeprecated-non-prototype, -Wparentheses-equality)

src/callback.c

@@ -332,7 +332,7 @@ void backannotate_at_cursor_b_pos(xRect *r, Graph_ctx *gr)
            cnt = 0;
         }
         if(xx >= start && xx <= end) {
-          if((dataset == sweepvar_wrap)) {
+          if(dataset == sweepvar_wrap) {
             dbg(1, "xx=%g cursor2=%g first=%d last=%d start=%g end=%g p=%d wrap=%d sweepvar_wrap=%d ofs=%d\n",
               xx, cursor2, first, last, start, end, p, wrap, sweepvar_wrap, ofs);
             if(first == -1) first = p;

src/eval_expr.y

@@ -16,7 +16,7 @@ static int dbglev = 1;
 struct symrec
 {
   char *name;  /* name of symbol */
-  double (*fnctptr)();  /* value of a FNCT */
+  double (*fnctptr)(double);  /* value of a FNCT */
   struct symrec *next;    /* link field */
 };
 

src/scheduler.c

@@ -2158,7 +2158,7 @@ int xschem(ClientData clientdata, Tcl_Interp *interp, int argc, const char * arg
       if(argc > 2 ) {
         what = atoi(argv[2]);
       }
-      if((xctx->semaphore == 0)) go_back(what);
+      if(xctx->semaphore == 0) go_back(what);
       Tcl_ResetResult(interp);
     }
 
@@ -3356,7 +3356,7 @@ int xschem(ClientData clientdata, Tcl_Interp *interp, int argc, const char * arg
                             "-message {Please Set netlisting mode (Options menu)}");
         tclsetboolvar("keep_symbols", save_keep);
 
-        if( (erc == 0) ) {
+        if(erc == 0) {
           my_strncpy(xctx->netlist_name, "", S(xctx->netlist_name));
         }
       }