fix fmc warning

Signed-off-by: huhui <huhui@sharkgulf.com>

Application/bsp/fmc_flash.c

@@ -134,7 +134,7 @@ static void _fmc_read_data(uint32_t addr, uint8_t *data, int len){
 
 static void _fmc_erase_addr(uint32_t addr, int len){
 	fmc_unlock();
-	uint32_t pages = len/one_page_size + ((len % one_page_size) > 0)?1:0;
+	uint32_t pages = len/one_page_size + (((len % one_page_size) > 0)?1:0);
 	for (int i = 0; i < pages; i++){
 		fmc_flag_clear(FMC_FLAG_PGERR | FMC_FLAG_WPERR | FMC_FLAG_END);
 		fmc_page_erase(addr + i * one_page_size);