staging: speakup: main: switch multiple assignment for one assignment per line

One assignment per line is preferred, instead of multiple assignments.
To make it more readable.
Issue found with checkpatch.
Signed-off-by: Lourdes Pedrajas <lu@pplo.net>
Reviewed-by: Samuel Thibautl <samuel.thibault@ens-lyon.org>
Link: https://lore.kernel.org/r/20200315221247.16629-1-lu@pplo.netSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/main.c

@@ -2117,7 +2117,8 @@ speakup_key(struct vc_data *vc, int shift_state, int keycode, u_short keysym,
 			spk_keydown = 0;
 			goto out;
 		}
-		value = spk_lastkey = pad_chars[value];
+		value = pad_chars[value];
+		spk_lastkey = value;
 		spk_keydown++;
 		spk_parked &= 0xfe;
 		goto no_map;