ndctl: fix libtool versioning

Commit fdd4f06 ("libndctl, ars: add an API to retrieve clear_err_unit")
incremented the libtool versioning 'vurrent', but neglected to increment
the 'age', resulting in an soname bump.

Fixes: commit fdd4f06 ("libndctl, ars: add an API to retrieve clear_err_unit")
Reported-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
diff --git a/Makefile.am.in b/Makefile.am.in
index b23b175..479d4a5 100644
--- a/Makefile.am.in
+++ b/Makefile.am.in
@@ -37,7 +37,7 @@
 
 LIBNDCTL_CURRENT=16
 LIBNDCTL_REVISION=0
-LIBNDCTL_AGE=9
+LIBNDCTL_AGE=10
 
 LIBDAXCTL_CURRENT=3
 LIBDAXCTL_REVISION=0