sony-laptop: fix uninitialised variable

drivers/misc/sony-laptop.c: In function 'sony_acpi_add':
drivers/misc/sony-laptop.c:456: warning: 'result' may be used uninitialized in this function

The compiler seems to actually be telling the truth this time.

Cc: Mattia Dongili <malattia@linux.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/misc/sony-laptop.c

@@ -453,7 +453,7 @@ static int sony_acpi_resume(struct acpi_device *device)
 static int sony_acpi_add(struct acpi_device *device)
 {
 	acpi_status status;
-	int result;
+	int result = 0;
 	acpi_handle handle;
 
 	sony_acpi_acpi_device = device;