camera: Initialize variable in create().
camera: Initialize variable in create().

This error appears at building time:
  gstomx_camera.c: In function 'create':
  gstomx_camera.c:404: error: 'ret' may be used uninitialized in this function

Signed-off-by: Daniel Diaz <ed054987dd20aebbd314fbb0d175066628f13717@ti.com>

mrchapp/gst-openmax,mrchapp/gst-openmax,mrchapp/gst-openmax,mrchapp/gst-openmax-devel,mrchapp/gst-openmax-devel,mrchapp/gst-openmax-devel