Return error if patch file passed to state file.patch is malformed

If patch file provided for file.patch state is malformed then state
returns `Patch was already applied` but patch is not applied.

          ID: patch_example
    Function: file.patch
        Name: /tmp/example
      Result: True
     Comment: Patch was already applied
     Started: 12:20:50.953163
    Duration: 61.558 ms
     Changes:

It is better to return error in such case.

          ID: patch_example
    Function: file.patch
        Name: /tmp/example
      Result: False
     Comment: /usr/bin/patch: **** malformed patch at line 7:
     Started: 12:33:44.915605
    Duration: 59.202 ms
     Changes:

changelog/59806.added

@@ -0,0 +1 @@
+Return error if patch file passed to state file.patch is malformed.

salt/states/file.py

@@ -6888,6 +6888,11 @@ def _patch(patch_file, options=None, dry_run=False):
 
         pre_check = _patch(patch_file, patch_opts)
         if pre_check["retcode"] != 0:
+            if not os.path.exists(patch_rejects) or os.path.getsize(patch_rejects) == 0:
+                ret["comment"] = pre_check["stderr"]
+                ret["result"] = False
+                return ret
+
             # Try to reverse-apply hunks from rejects file using a dry-run.
             # If this returns a retcode of 0, we know that the patch was
             # already applied. Rejects are written from the base of the