Fix spelling mistakes using codespell

This commit corrects various spelling mistakes throughout the
repository. The corrections were made automatically using `codespell`[1]
tool.

[1]: https://github.com/codespell-project/codespell

Change-Id: If0e6eb00a28316787175e77d183f5b805c34e24d
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/nbd-proxy.c b/nbd-proxy.c
index e6d12f3..68b18c9 100644
--- a/nbd-proxy.c
+++ b/nbd-proxy.c
@@ -254,7 +254,7 @@
     rc = pipe2(ctx->signal_pipe, O_CLOEXEC);
     if (rc)
     {
-        warn("cant setup signal pipe");
+        warn("can't setup signal pipe");
         return -1;
     }