chip/s698pm_cpustart.c: Fix compile error

chip/s698pm_cpustart.c: In function 's698pm_cpu_boot':
Error: chip/s698pm_cpustart.c:74:17: error: unused variable 'tcb' [-Werror=unused-variable]
   struct tcb_s *tcb = this_task();
                 ^~~
cc1: all warnings being treated as errors
make[1]: *** [Makefile:99: s698pm_cpustart.o] Error 1
make[1]: Target 'libarch.a' not remade because of errors.
make: *** [tools/LibTargets.mk:164: arch/sparc/src/libarch.a] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 370: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory
  Normalize s698pm-dkit/smp

Signed-off-by: hujun5 <[email protected]>

arch/sparc/src/s698pm/s698pm_cpustart.c

@@ -71,8 +71,6 @@ volatile static spinlock_t g_cpu_boot;
 
 void s698pm_cpu_boot(void)
 {
-  struct tcb_s *tcb = this_task();
-
   _info("CPU%d Started\n", this_cpu());
 
   /* Initialize CPU interrupts */
@@ -84,12 +82,12 @@ void s698pm_cpu_boot(void)
 #ifdef CONFIG_SCHED_INSTRUMENTATION
   /* Notify that this CPU has started */
 
-  sched_note_cpu_started(tcb);
+  sched_note_cpu_started(this_task());
 #endif
 
   /* Reset scheduler parameters */
 
-  nxsched_resume_scheduler(tcb);
+  nxsched_resume_scheduler(this_task());
 
   /* And finally, enable cpu interrupts */