When a new struct magic_set is created as the handle to the calling application
(in magic_open), the "file" char * is not NULLified.  This causes unexplained
segfaults in other apps that don't properly have their magic.mgc file created,
i.e. in app-arch/rpm-4.4.6-r3.  The file pointer is some random value, so when
file_magwarn tries to report a missing magic.mgc file, for example, it tries to
print ms->file, which is NULL, and the segfault occurs.

Fix by Jeff Hansen.

http://bugs.gentoo.org/163948

--- src/magic.c
+++ src/magic.c
@@ -110,6 +110,7 @@ magic_open(int flags)
 	ms->haderr = 0;
 	ms->error = -1;
 	ms->mlist = NULL;
+	ms->file = NULL;
 	return ms;
 free3:
 	free(ms->o.pbuf);