platform/x86: dell-smo8800: remove redundant assignments to byte_data

Variable byte_data is being initialized and re-assigned with values that
are never read. Remove these as these redundant assignments. Cleans up
clang warning:

drivers/platform/x86/dell-smo8800.c:106:2: warning: Value stored to 'byte_data'
is never read

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/dell-smo8800.c

@@ -90,7 +90,7 @@ static ssize_t smo8800_misc_read(struct file *file, char __user *buf,
 					 struct smo8800_device, miscdev);
 
 	u32 data = 0;
-	unsigned char byte_data = 0;
+	unsigned char byte_data;
 	ssize_t retval = 1;
 
 	if (count < 1)
@@ -103,7 +103,6 @@ static ssize_t smo8800_misc_read(struct file *file, char __user *buf,
 	if (retval)
 		return retval;
 
-	byte_data = 1;
 	retval = 1;
 
 	if (data < 255)