File fix-modinfo.patch of Package obs-studio

--- a/plugins/linux-v4l2/linux-v4l2.c	2021-01-09 00:43:39.000000000 +0100
+++ b/plugins/linux-v4l2/linux-v4l2.c	2021-03-21 17:15:01.499518184 +0100
@@ -31,7 +31,7 @@
 {
 	bool loaded = false;
 
-	int ret = system("modinfo v4l2loopback >/dev/null 2>&1");
+	int ret = system("/sbin/modinfo v4l2loopback >/dev/null 2>&1");
 
 	if (ret == 0)
 		loaded = true;