fs_mgr: fstab: Fix parse warning typo

Looks like a copy-paste omission.

Change-Id: Ib8ad3a938654786747540690f4bba93d6573d74d
Signed-off-by: Felix <google@ix5.org>
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index 561d994..c55e532 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -211,7 +211,7 @@
             }
         } else if (StartsWith(flag, "swapprio=")) {
             if (!ParseInt(arg, &entry->swap_prio)) {
-                LWARNING << "Warning: length= flag malformed: " << arg;
+                LWARNING << "Warning: swapprio= flag malformed: " << arg;
             }
         } else if (StartsWith(flag, "zramsize=")) {
             if (!arg.empty() && arg.back() == '%') {