Fix number of args in tools/patch_module.sh

Change-Id: I697651c89842e9fd21bd237036e3b2f4e531063b
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

tools/patch_module.sh

@@ -16,7 +16,7 @@
 # limitations under the License.
 #######################################################################################
 
-if [ $# -ne 3 ]; then
+if [ $# -ne 2 ]; then
     echo "Usage $0 <module> <tag_number>"
     echo "Example: $0 ro 2"
     echo "Example: $0 lcm 5"