Fixes the following W=1 kernel build warning(s):
 drivers/tty/serial/st-asc.c:73: warning: expecting prototype for Some of status comes from higher bits of the character and some come from(). Prototype was for ASC_RXBUF_DUMMY_RX() instead
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-serial@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210520121906.3468725-10-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 
 /* ASC_RXBUF */
 #define ASC_RXBUF_PE                   0x100
 #define ASC_RXBUF_FE                   0x200
-/**
+/*
  * Some of status comes from higher bits of the character and some come from
  * the status register. Combining both of them in to single status using dummy
  * bits.