serial: core: drop redundant sysrq checks

The sysrq timestamp will never be set unless port->has_sysrq is set (see
uart_handle_break()) so drop the redundant checks that were added by
commit 1997e9dfdc ("serial_core: Un-ifdef sysrq SUPPORT_SYSRQ").

Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Link: https://lore.kernel.org/r/20200610152232.16925-4-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/serial_core.h

@@ -469,7 +469,7 @@ bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch);
 
 static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 {
-	if (!port->has_sysrq || !port->sysrq)
+	if (!port->sysrq)
 		return 0;
 
 	if (ch && time_before(jiffies, port->sysrq)) {
@@ -488,7 +488,7 @@ static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch
 
 static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
 {
-	if (!port->has_sysrq || !port->sysrq)
+	if (!port->sysrq)
 		return 0;
 
 	if (ch && time_before(jiffies, port->sysrq)) {