media: camera-sensor.rst: fix a doc build warning

Documentation/driver-api/media/camera-sensor.rst:123: WARNING: Inline literal start-string without end-string.

There's a missing blank line over there.

Link: https://lore.kernel.org/linux-media/c326774ad841b905c3b2925e5f8f509d29fb4c6f.1599656828.git.mchehab+huawei@kernel.orgSigned-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/driver-api/media/camera-sensor.rst

@@ -145,6 +145,7 @@ after the power state transition has taken place. The ``s_ctrl`` callback can be
 used to obtain device's power state after the power state transition:
 
 .. c:function::
+
 	int pm_runtime_get_if_in_use(struct device *dev);
 
 The function returns a non-zero value if it succeeded getting the power count or