ANDROID: f2fs: fix incorrect merge resolution in f2fs_trace_rw_file_path()

The merge included

commit bbedc64d ("f2fs: factor the read/write tracing logic into a helper")

During merge we accidentally undid a part of the change from

commit fae611f4 ("f2fs: allocate trace path buffer from names_cache")

This patch fixes it by using f2fs_getname() to match with f2fs_putname()
at the end.

Bug: 409714766
Fixes: bfad6b01 ("Merge tag 'android14-6.1.115_r00' into android14-6.1")
Change-Id: I56f78e560c0847939773c9773064bc60561effcb
Signed-off-by: Sandeep Dhavale <dhavale@google.com>