drivers/media/common/tuners/xc5000: fix 'warning: 'lock_status' may be used uninitialized in this function'

Change-Id: Ic589ac77b1874ccd814b394105d25c33e7852d0a
Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
drivers/media/common/tuners/xc5000: fix 'warning: 'adc_envelope' may be used uninitialized in this function'

Change-Id: I881df0a1e9c53e3546f3c4da359d3b6dc7d4ecf7
Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
drivers/media/common/tuners/xc4000: fix 'warning: '...' may be used uninitialized in this function'

Change-Id: Ifdfa5064905a157dcbe9e1cf6ec2a391bf0288ba
Signed-off-by: Dennis Rassmann <showp1984@gmail.com>