vimc: fix close(-1)

~IPAVimc() checks if fd != 0, but it should check if fd != -1.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/vimc/vimc.cpp

@@ -61,7 +61,7 @@ IPAVimc::IPAVimc()
 
 IPAVimc::~IPAVimc()
 {
-	if (fd_)
+	if (fd_ != -1)
 		::close(fd_);
 }