MAINTAINERS: assign lib/charset.c

lib/charset.c is only used by the EFI subsystem.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

MAINTAINERS

diff --git a/MAINTAINERS b/MAINTAINERS
index a2293b7..988fb1a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -368,6 +368,7 @@
 F:	include/efi*
 F:	include/pe.h
 F:	include/asm-generic/pe.h
+F:	lib/charset.c
 F:	lib/efi*/
 F:	test/py/tests/test_efi*
 F:	cmd/bootefi.c