drivers: misc: Mark function jp_generic_ide_ioctl() as static in lkdtm.c

This patch marks the function jp_generic_ide_ioctl() as static in
lkdtm.c because it is not used outside this file.

Thus, it also eliminates the following warnings in lkdtm.c:
drivers/misc/lkdtm.c:227:5: warning: no previous prototype for ‘jp_generic_ide_ioctl’ [-Wmissing-prototypes]
Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/lkdtm.c

@@ -224,7 +224,7 @@ static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd)
 }
 
 #ifdef CONFIG_IDE
-int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,
+static int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,
 			struct block_device *bdev, unsigned int cmd,
 			unsigned long arg)
 {