media: Staging: media: atomisp: made function static

Fixed sparse warning by making 'dtrace_dot' function static.
Signed-off-by: Sergiy Redko <sergredko@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c

@@ -2567,6 +2567,7 @@ ia_css_debug_mode_enable_dma_channel(int dma_id,
 	return rc;
 }
 
+static
 void dtrace_dot(const char *fmt, ...)
 {
 	va_list ap;