target/cortex_m: call adapter_deassert_reset() only if srst is configured

Deasserting is useless if reset was not asserted except the very corner
case: changed reset_config during reset processing.

Change-Id: I1d1ea142980d67293daa348a2869b68ffd78d0eb
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/8734
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

Author: tom-van

src/target/cortex_m.c

@@ -1849,10 +1849,12 @@ static int cortex_m_deassert_reset(struct target *target)
 		target_state_name(target),
 		target_was_examined(target) ? "" : " not");
 
+	enum reset_types jtag_reset_config = jtag_get_reset_config();
+
 	/* deassert reset lines */
-	adapter_deassert_reset();
+	if (jtag_reset_config & RESET_HAS_SRST)
+		adapter_deassert_reset();
 
-	enum reset_types jtag_reset_config = jtag_get_reset_config();
 
 	if ((jtag_reset_config & RESET_HAS_SRST) &&
 		!(jtag_reset_config & RESET_SRST_NO_GATING) &&