Fixing voltctl version in Dockerfile

Change-Id: I8ead6e4ee2e11b1f3323c3aee51e197ffcb80a54
diff --git a/docker/Dockerfile.voltctl b/docker/Dockerfile.voltctl
index cd30dcb..a394938 100644
--- a/docker/Dockerfile.voltctl
+++ b/docker/Dockerfile.voltctl
@@ -15,7 +15,7 @@
 FROM busybox:1.31.1-glibc
 
 RUN mkdir -p /usr/bin
-RUN wget -O - https://github.com/opencord/voltctl/releases/download/v1.6.1./voltctl-1.6.1.-linux-amd64 > /usr/bin/voltctl
+RUN wget -O - https://github.com/opencord/voltctl/releases/download/v1.6.1/voltctl-1.6.1-linux-amd64 > /usr/bin/voltctl
 COPY volt.config /root/.volt/config
 RUN chmod a+x /usr/bin/voltctl && sync && voltctl completion bash >> /root/.bashrc
 CMD ["sh", "-c", "sleep infinity"]