package/dmraid: fix 'maintenance' typo

Found by codespell.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/dmraid/0001-fix-compilation-under-musl.patch

@@ -8,7 +8,7 @@ Patch borrowed from Void Linux :
 https://github.com/voidlinux/void-packages/blob/master/srcpkgs/dmraid/patches/25_musl-libc.patch
 
 Upstream package appears dormant, no mailing list and no
-maintainence releases since Nov 2010.
+maintenance releases since Nov 2010.
 
 Upstream-Status: dormant
 Signed-off-by: Brendan Heading <brendanheading@gmail.com>