encoding/base32: remove ineffectual assignment in test
encoding/base32: remove ineffectual assignment in test

Change-Id: I8aaa3d1d2797f3ace34bc09f5123538f6a77efce
GitHub-Last-Rev: 2758c462041ff5e444651b7927d53e809d2efe4d
GitHub-Pull-Request: golang/go#30009
Reviewed-on: https://go-review.googlesource.com/c/160433
Reviewed-by: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
Run-TryBot: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

cloudflare/go,josharian/go,golang/go,CAFxX/go,golang/go,nawawi/go,CAFxX/go,akutz/go,nawawi/go,CAFxX/go,josharian/go,akutz/go,josharian/go,akutz/go,akutz/go,akutz/go,golang/go,nawawi/go,nawawi/go,cloudflare/go,josharian/go,CAFxX/go,akutz/go,josharian/go,cloudflare/go,nawawi/go,nawawi/go,CAFxX/go,josharian/go,cloudflare/go,cloudflare/go,cloudflare/go,CAFxX/go,golang/go,akutz/go,akutz/go,nawawi/go,golang/go,nawawi/go,golang/go,cloudflare/go,josharian/go,golang/go,golang/go,CAFxX/go,CAFxX/go,cloudflare/go,josharian/go