print_help: simplify function to always use stdout

It's only called in two places and always uses stdout.

src/fish_indent.cpp

@@ -341,7 +341,7 @@ int main(int argc, char *argv[]) {
                 break;
             }
             case 'h': {
-                print_help("fish_indent", 1);
+                print_help("fish_indent");
                 exit(0);
             }
             case 'v': {

src/fish_key_reader.cpp

@@ -312,7 +312,7 @@ static bool parse_flags(int argc, char **argv, bool *continuous_mode, bool *verb
                 break;
             }
             case 'h': {
-                print_help("fish_key_reader", 1);
+                print_help("fish_key_reader");
                 exit(0);
             }
             case 'v': {

src/print_help.cpp

@@ -14,9 +14,9 @@
 
 #define HELP_ERR "Could not show help message\n"
 
-void print_help(const char *c, int fd) {
+void print_help(const char *c) {
     char cmd[CMD_LEN];
-    int printed = snprintf(cmd, CMD_LEN, "fish -c '__fish_print_help %s >&%d'", c, fd);
+    int printed = snprintf(cmd, CMD_LEN, "fish -c '__fish_print_help %s'", c);
 
     if (printed < CMD_LEN && system(cmd) == -1) {
         write_loop(2, HELP_ERR, std::strlen(HELP_ERR));

src/print_help.h

@@ -3,6 +3,6 @@
 #define FISH_PRINT_HELP_H
 
 /// Print help message for the specified command.
-void print_help(const char *cmd, int fd);
+void print_help(const char *cmd);
 
 #endif