jtag: xds110: fix clang error core.StackAddressEscape

Clang ignores that xds110_swd_write_reg() is always called with
bit SWD_CMD_RNW in 'cmd' set to zero.
It then complains that the local variable 'value' gets passed by
address to xds110_swd_queue_cmd() and in case of 'read request'
such stack address get stored for later use:
	src/jtag/drivers/xds110.c:1363:1: warning: Address of
	 stack memory associated with local variable 'value' is
	 still referred to by the global variable 'xds110' upon
	 returning to the caller. This will be a dangling
	 reference [core.StackAddressEscape]

To both xds110_swd_write_reg() and xds110_swd_read_reg(), add an
assert() to inform Clang about the state of bit SWD_CMD_RNW.

Change-Id: I7687c055ec71424b642e152f478723a930966e3a
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7380
Tested-by: jenkins

src/jtag/drivers/xds110.c

@@ -1354,11 +1354,13 @@ static void xds110_swd_queue_cmd(uint8_t cmd, uint32_t *value)
 static void xds110_swd_read_reg(uint8_t cmd, uint32_t *value,
 	uint32_t ap_delay_clk)
 {
+	assert(cmd & SWD_CMD_RNW);
 	xds110_swd_queue_cmd(cmd, value);
 }
 static void xds110_swd_write_reg(uint8_t cmd, uint32_t value,
 	uint32_t ap_delay_clk)
 {
+	assert(!(cmd & SWD_CMD_RNW));
 	xds110_swd_queue_cmd(cmd, &value);
 }