sp19, tm26: Address set but unused warnings

GCC 16 flagged this while GCC 15 did not. On some targets, the
macros used to ensure the floating point context was fully in
use with task specific values would result in set but unused
warnings. Tweaked the tests and macros as needed to eliminate
the warnings.

testsuites/sptests/sp19/first.c

@@ -57,6 +57,8 @@ rtems_task First_FP_task( rtems_task_argument argument )
     INTEGER_factors[ task_index ]
   );
   put_name( Task_name[ task_index ], FALSE );
+  FP_CHECK( FP_factors[ task_index ] );
+  INTEGER_CHECK( INTEGER_factors[ task_index ] );
   #if ( RTEMS_HAS_HARDWARE_FP == 1 )
   printf( " - float base = (%g)\n", FP_factors[ task_index ] );
   #else

testsuites/tmtests/tm26/fptest.h

@@ -54,7 +54,7 @@
 
 #define FP_DECLARE
 #define FP_LOAD( _factor )
-#define FP_CHECK( _factor ) 0
+#define FP_CHECK( _factor )
 
 #else
 

testsuites/tmtests/tm26/task1.c

@@ -399,6 +399,12 @@ rtems_task Floating_point_task_1( rtems_task_argument argument )
   Thread_Control *executing;
   FP_DECLARE;
 
+  int task_index = argument; /* task_index is used by FP_CHECK */
+
+  FP_LOAD( 1.0 );
+  FP_CHECK( 1.0 );
+  (void) task_index;
+
   context_switch_restore_1st_fp_time = benchmark_timer_read();
 
   executing = _Thread_Get_executing();
@@ -427,6 +433,7 @@ rtems_task Floating_point_task_1( rtems_task_argument argument )
   context_switch_save_idle_restore_initted_time = benchmark_timer_read();
 
   FP_LOAD( 1.0 );
+  FP_CHECK( 1.0 );
 
   executing = _Thread_Get_executing();
 
@@ -457,6 +464,12 @@ rtems_task Floating_point_task_2( rtems_task_argument argument )
   Thread_Control *executing;
   FP_DECLARE;
 
+  int task_index = argument; /* task_index is used by FP_CHECK */
+
+  FP_LOAD( 1.0 );
+  FP_CHECK( 1.0 );
+  (void) task_index;
+
   context_switch_save_restore_idle_time = benchmark_timer_read();
 
   executing = _Thread_Get_executing();