kconfig: Only generate config_is_xxx for bool and tristate options

For strings and integers, the config_is_xxx macros are useless and
sometimes misleading:

  #define CONFIG_INITRAMFS_SOURCE ""
  #define config_is_initramfs_source() 1

Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/kconfig/confdata.c

@@ -798,7 +798,6 @@ int conf_write_autoconf(void)
 	const char *name;
 	FILE *out, *tristate, *out_h;
 	int i;
-	int fct_val;
 
 	sym_clear_all_valid();
 
@@ -839,7 +838,7 @@ int conf_write_autoconf(void)
 		       rootmenu.prompt->text);
 
 	for_all_symbols(i, sym) {
-		fct_val = 1;
+		int fct_val = 0;
 		sym_calc_value(sym);
 		if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 			continue;
@@ -853,7 +852,6 @@ int conf_write_autoconf(void)
 		case S_TRISTATE:
 			switch (sym_get_tristate_value(sym)) {
 			case no:
-				fct_val = 0;
 				break;
 			case mod:
 				fprintf(tristate, "%s%s=M\n",
@@ -868,8 +866,10 @@ int conf_write_autoconf(void)
 					    CONFIG_, sym->name);
 				fprintf(out_h, "#define %s%s 1\n",
 				    CONFIG_, sym->name);
+				fct_val = 1;
 				break;
 			}
+			conf_write_function_autoconf(out_h, CONFIG_, sym->name, fct_val);
 			break;
 		case S_STRING:
 			conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
@@ -887,10 +887,8 @@ int conf_write_autoconf(void)
 			    CONFIG_, sym->name, str);
 			break;
 		default:
-			fct_val = 0;
 			break;
 		}
-		conf_write_function_autoconf(out_h, CONFIG_, sym->name, fct_val);
 	}
 	fclose(out);
 	fclose(tristate);