nuttx/wamr.mk: Fix extraneous text after 'endif' directive (#2912)

product-mini/platforms/nuttx/wamr.mk

@@ -210,7 +210,7 @@ ifeq ($(CONFIG_INTERPRETERS_WAMR_AOT_STACK_FRAME), y)
 CFLAGS += -DWASM_ENABLE_AOT_STACK_FRAME=1
 else
 CFLAGS += -DWASM_ENABLE_AOT_STACK_FRAME=0
-endif ()
+endif
 
 ifeq ($(CONFIG_INTERPRETERS_WAMR_PERF_PROFILING),y)
 CFLAGS += -DWASM_ENABLE_PERF_PROFILING=1