ns2: fixup gprs_ns2_prim_strs

The gprs_ns2_prim_strs was merged to early. The renaming
in the last gerrit patchset wasn't done correct.

Change-Id: Ie8e1e003d70af48f2d647b2c2701d4fc0f17e307
diff --git a/src/gb/gprs_ns2.c b/src/gb/gprs_ns2.c
index 6ddc58b..cf04924 100644
--- a/src/gb/gprs_ns2.c
+++ b/src/gb/gprs_ns2.c
@@ -206,7 +206,7 @@
 	{ 0, NULL }
 };
 
-const struct value_string ns2_prim_str[] = {
+const struct value_string gprs_ns2_prim_strs[] = {
 	{ PRIM_NS_UNIT_DATA,	"UNIT DATA" },
 	{ PRIM_NS_CONGESTION,	"CONGESTION" },
 	{ PRIM_NS_STATUS,	"STATUS" },