m68k: mvme16x: Remove unused sink in mvme16x_cons_write()

When building with W=1:

    arch/m68k/mvme16x/config.c: In function ‘mvme16x_cons_write’:
    arch/m68k/mvme16x/config.c:211:25: warning: variable ‘sink’ set but not used [-Wunused-but-set-variable]
      211 |         volatile u_char sink;
	  |                         ^~~~

Fix this by removing the unused variable and assignment.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/22c4d1978f811d7f4495eeb269ce06304717627a.1694613528.git.geert@linux-m68k.org

arch/m68k/mvme16x/config.c

@@ -208,7 +208,6 @@ static void __init mvme16x_init_IRQ (void)
 void mvme16x_cons_write(struct console *co, const char *str, unsigned count)
 {
 	volatile unsigned char *base_addr = (u_char *)CD2401_ADDR;
-	volatile u_char sink;
 	u_char ier;
 	int port;
 	u_char do_lf = 0;
@@ -229,7 +228,7 @@ void mvme16x_cons_write(struct console *co, const char *str, unsigned count)
 		if (in_8(PCCSCCTICR) & 0x20)
 		{
 			/* We have a Tx int. Acknowledge it */
-			sink = in_8(PCCTPIACKR);
+			in_8(PCCTPIACKR);
 			if ((base_addr[CyLICR] >> 2) == port) {
 				if (i == count) {
 					/* Last char of string is now output */