sparc: remove redundant return statements

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/prom/console_32.c

@@ -94,5 +94,4 @@ void
 prom_putchar(char c)
 {
 	while(prom_nbputchar(c) == -1) ;
-	return;
 }