Revert "ANDROID: dm: do_mounts_dm: fix dm_substitute_devices()"

This reverts commit 052d02c07c.

Bug: 129143048
Test: Boot cuttlefish from AOSP

Signed-off-by: Sandeep Patil <sspatil@android.com>

init/do_mounts_dm.c

@@ -176,8 +176,7 @@ static void __init dm_substitute_devices(char *str, size_t str_len)
 			continue;
 
 		/* Temporarily terminate with a nul */
-		if (*candidate_end)
-			candidate_end--;
+		candidate_end--;
 		old_char = *candidate_end;
 		*candidate_end = '\0';