cpukit/rtems/rtemsobjectgetclassinfo.c: Address -Wsign-compare warnings

This warning occurs when comparing a signed variable to an unsigned one.
This is frequently an int or ssize_t variable compared to a uint32_t or
size_t. Sometimes the size_t is from a sizeof() use.

cpukit/rtems/src/rtemsobjectgetclassinfo.c

@@ -49,8 +49,8 @@ rtems_status_code rtems_object_get_class_information(
 )
 {
   Objects_Information *obj_info;
-  int                  unallocated;
-  int                  i;
+  uint32_t             unallocated;
+  uint32_t             i;
 
   /*
    * Validate parameters and look up information structure.