net: remove an arbitrary timeout in TestUDPReadSizeError
net: remove an arbitrary timeout in TestUDPReadSizeError

Looking at the condition actually exercised by the test it seems
unnecessary: assuming that the Write succeeds (checked earlier in the
test), the Read must have a nonzero number of bytes available to read
immediately. (That is not the case in TestUDPZeroByteBuffer, from
which this test appears to have been derived.)

Fixes #50870

Change-Id: Ia6040a2d5dc320f0b86ec9d6f6b91dc72e8f3b84
Reviewed-on: https://go-review.googlesource.com/c/go/+/382537
Trust: Bryan Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
Run-TryBot: Bryan Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

CAFxX/go,golang/go,CAFxX/go,cloudflare/go,cloudflare/go,golang/go,cloudflare/go,golang/go,golang/go,nawawi/go,cloudflare/go,CAFxX/go,nawawi/go,nawawi/go,nawawi/go,cloudflare/go,CAFxX/go,golang/go,golang/go,CAFxX/go,golang/go,golang/go,cloudflare/go,CAFxX/go,cloudflare/go,nawawi/go,nawawi/go,cloudflare/go,nawawi/go,CAFxX/go,CAFxX/go,nawawi/go