Fix *.txt source inference dataloader (#4468)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/data/loaders.py

@@ -182,7 +182,7 @@ class LoadImages:
         parent = None
         if isinstance(path, str) and Path(path).suffix == '.txt':  # *.txt file with img/vid/dir on each line
             parent = Path(path).parent
-            path = Path(path).read_text().rsplit()
+            path = Path(path).read_text().splitlines()  # list of sources
         files = []
         for p in sorted(path) if isinstance(path, (list, tuple)) else [path]:
             a = str(Path(p).absolute())  # do not use .resolve() https://github.com/ultralytics/ultralytics/issues/2912