selftests: rust: config: add trailing newline

If adding multiple config files to the merge_config.sh script and
rust/config is the fist one, then the last config fragment in this file
and the first config fragment in the second file won't be set, since
there isn't a newline in this file, so those two fragements end up at
the same row like:
CONFIG_SAMPLE_RUST_PRINT=mCONFIG_FRAGMENT=y

And non of those will be enabled when running 'olddefconfig' after.

Fixing the issue by adding a newline to the file.

Signed-off-by: Anders Roxell <[email protected]>
Acked-by: Miguel Ojeda <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: roxell

tools/testing/selftests/rust/config

@@ -2,4 +2,4 @@ CONFIG_RUST=y
 CONFIG_SAMPLES=y
 CONFIG_SAMPLES_RUST=y
 CONFIG_SAMPLE_RUST_MINIMAL=m
-CONFIG_SAMPLE_RUST_PRINT=m
+CONFIG_SAMPLE_RUST_PRINT=m