scripts: kconfig: merge_config: config files: add a trailing newline

[ Upstream commit 33330bcf031818e60a816db0cfd3add9eecc3b28 ]

When merging files without trailing newlines at the end of the file, two
config fragments end up at the same row if file1.config doens't have a
trailing newline at the end of the file.

file1.config "CONFIG_1=y"
file2.config "CONFIG_2=y"
./scripts/kconfig/merge_config.sh -m .config file1.config file2.config

This will generate a .config looking like this.
cat .config
...
CONFIG_1=yCONFIG_2=y"

Making sure so we add a newline at the end of every config file that is
passed into the script.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

scripts/kconfig/merge_config.sh

@@ -167,6 +167,8 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
 			sed -i "/$CFG[ =]/d" $MERGE_FILE
 		fi
 	done
+	# In case the previous file lacks a new line at the end
+	echo >> $TMP_FILE
 	cat $MERGE_FILE >> $TMP_FILE
 done