staging: vt6655: Fix space around binary operator

Fix the check as per Linux kernel style for use of spaces
CHECK: spaces preferred around that '-'
Signed-off-by: Madhumitha Prabakaran <madhumithabiw@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/rf.c

@@ -792,7 +792,7 @@ bool RFbSetPower(
 			byDec = byPwr + 10;
 
 		if (byDec >= priv->byMaxPwrLevel)
-			byDec = priv->byMaxPwrLevel-1;
+			byDec = priv->byMaxPwrLevel - 1;
 
 		byPwr = byDec;
 		break;