fs/ext4-new-features: Add absolute path for the test

After commit 33a4adf
tests need absolute path. If not given it would return TBROK.
Add an absolute path before running fallocate0${i} in ext4-new-features.

Signed-off-by: Zeng Linggang <[email protected]>
Acked-by: Cyril Hrubis <[email protected]>

Author: zenglg

testcases/kernel/fs/ext4-new-features/ext4-persist-prealloc/ext4_persist_prealloc_test.sh

@@ -55,7 +55,7 @@ ext4_test_persist_prealloc()
 		fi
 
 		temp_tmpdir=$TMPDIR
-		TMPDIR=mnt_point; fallocate0${i} > /dev/null 2>&1
+		TMPDIR=${PWD}/mnt_point; fallocate0${i} > /dev/null 2>&1
 		ret=$?
 		TMPDIR=$temp_tmpdir