sapi: Avoid declaration in source, fix type

cpukit/sapi/include/rtems/io.h

@@ -254,6 +254,8 @@ extern const size_t _IO_Number_of_drivers;
 
 extern rtems_driver_address_table _IO_Driver_address_table[];
 
+extern bool _IO_All_drivers_initialized;
+
 /**
  * @brief Initialization of all device drivers.
  *

cpukit/sapi/src/io.c

@@ -21,13 +21,13 @@
 
 #include <rtems/io.h>
 
-int _IO_Manager_drivers_inititalized = 0;
+bool _IO_All_drivers_initialized;
 
 void _IO_Initialize_all_drivers( void )
 {
    rtems_device_major_number major;
 
-   _IO_Manager_drivers_inititalized = 1;
+   _IO_All_drivers_initialized = true;
 
    for ( major=0 ; major < _IO_Number_of_drivers ; major ++ )
      (void) rtems_io_initialize( major, 0, NULL );

cpukit/sapi/src/ioregisterdriver.c

@@ -25,8 +25,6 @@
 #include <rtems/rtems/intr.h>
 #include <rtems/score/threaddispatch.h>
 
-extern int _IO_Manager_drivers_inititalized;
-
 static inline bool rtems_io_is_empty_table(
   const rtems_driver_address_table *table
 )
@@ -110,7 +108,7 @@ rtems_status_code rtems_io_register_driver(
 
   _Thread_Enable_dispatch();
 
-  if ( _IO_Manager_drivers_inititalized ) {
+  if ( _IO_All_drivers_initialized ) {
     /* Other drivers have already been initialized, we initialize
      * the driver directly.
      */