bootloader: fix clang warning

bootloader.c

@@ -74,7 +74,7 @@ void main(void)
 	if (!dfu_force && (((*application)&0xFFFE0000)==0x20000000)) { // application at address seems valid
 		SCB_VTOR = (volatile uint32_t)(application); // set vector table to application vector table (store at the beginning of the application)
 		__asm__ volatile ("MSR msp,%0" : :"r"(*application)); // set stack pointer to address provided in the beginning of the application (loaded into a register first)
-		(*(void(**)())(application + 1))(); // start application (by jumping to the reset function which address is stored as second entry of the vector table)
+		(*(void(**)(void))(application + 1))(); // start application (by jumping to the reset function which address is stored as second entry of the vector table)
 	}
 
 	rcc_clock_setup_in_hse_8mhz_out_72mhz(); // start main clock