coding style: prototype of functions with no parameters

Functions that have no parameters should use "void" as parameter
in the function declaration.

Issue identified and fixed by script checkpatch from Linux kernel
v5.1 using the command

	find src/ -type f -exec ./tools/scripts/checkpatch.pl \
	-q --types FUNCTION_WITHOUT_ARGS --fix-inplace -f {} \;

Change-Id: If104ac75b44e939ec86155ff7b5720f2e33c6b39
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5621
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins

src/helper/log.c

@@ -401,7 +401,7 @@ char *alloc_printf(const char *format, ...)
  * fast when invoked more often than every 500ms.
  *
  */
-void keep_alive()
+void keep_alive(void)
 {
 	current_time = timeval_ms();
 	if (current_time-last_time > 1000) {
@@ -436,7 +436,7 @@ void keep_alive()
 }
 
 /* reset keep alive timer without sending message */
-void kept_alive()
+void kept_alive(void)
 {
 	current_time = timeval_ms();
 	last_time = current_time;

src/jtag/core.c

@@ -1872,7 +1872,7 @@ void jtag_set_verify(bool enable)
 	jtag_verify = enable;
 }
 
-bool jtag_will_verify()
+bool jtag_will_verify(void)
 {
 	return jtag_verify;
 }
@@ -1882,7 +1882,7 @@ void jtag_set_verify_capture_ir(bool enable)
 	jtag_verify_capture_ir = enable;
 }
 
-bool jtag_will_verify_capture_ir()
+bool jtag_will_verify_capture_ir(void)
 {
 	return jtag_verify_capture_ir;
 }

src/jtag/drivers/arm-jtag-ew.c

@@ -683,7 +683,7 @@ static int armjtagew_tap_execute(void)
 /****************************************************************************
  * JLink USB low-level functions */
 
-static struct armjtagew *armjtagew_usb_open()
+static struct armjtagew *armjtagew_usb_open(void)
 {
 	usb_init();
 

src/jtag/interface.c

@@ -45,7 +45,7 @@ void tap_set_state_impl(tap_state_t new_state)
 	state_follower = new_state;
 }
 
-tap_state_t tap_get_state()
+tap_state_t tap_get_state(void)
 {
 	return state_follower;
 }
@@ -64,7 +64,7 @@ void tap_set_end_state(tap_state_t new_end_state)
 	end_state_follower = new_end_state;
 }
 
-tap_state_t tap_get_end_state()
+tap_state_t tap_get_end_state(void)
 {
 	return end_state_follower;
 }

src/jtag/minidummy/minidummy.c

@@ -83,7 +83,7 @@ int interface_jtag_add_plain_dr_scan(int num_bits, const uint8_t *out_bits,
 	return ERROR_OK;
 }
 
-int interface_jtag_add_tlr()
+int interface_jtag_add_tlr(void)
 {
 	/* synchronously do the operation here */
 

src/jtag/zy1000/zy1000.c

@@ -486,7 +486,7 @@ int interface_jtag_add_plain_dr_scan(int num_bits,
 	return ERROR_OK;
 }
 
-int interface_jtag_add_tlr()
+int interface_jtag_add_tlr(void)
 {
 	setCurrentState(TAP_RESET);
 	return ERROR_OK;