[libcpu]context-m33:fix label error in context_gcc.S.
@@ -98,7 +98,7 @@ PendSV_Handler:
MSR PRIMASK, r2 /* if r1 == 0x00, do msr PRIMASK, r2 */
BX lr /* if r1 == 0x00, do bx lr */
-schedule
+schedule:
PUSH {r2} /* store interrupt state */
/* clear rt_thread_switch_interrupt_flag to 0 */
