fix typo in script

Change-Id: I346eeefb5395279ff8b28b8e03ce3c4a2ee1f7d8
diff --git a/tools/build/onos-change-version b/tools/build/onos-change-version
index f30b9c2..3ce5557 100755
--- a/tools/build/onos-change-version
+++ b/tools/build/onos-change-version
@@ -38,7 +38,7 @@
    $ONOS_ROOT/core/net/src/main/java/org/onosproject/core/impl/VersionManager.java
 
 # Augment the version in archetypes tree.
-mvn -f tools/package/archetypes/p om.xml versions:set -DnewVersion=$NEW_VERSION versions:commit
+mvn -f tools/package/archetypes/pom.xml versions:set -DnewVersion=$NEW_VERSION versions:commit
 for atype in api bundle cli rest ui uitab uitopo; do
     pom="tools/package/archetypes/$atype/src/main/resources/archetype-resources/pom.xml"
     sed -i".VERBACK" -E "1,/<onos.version>/s/<onos.version>[^<]*</<onos.version>$NEW_VERSION</g" $pom