[patch] ShellPkg: Fix the incorrect return status in function FindFiles()

[Dandan Bi <dandan.bi@intel.com>]

According to the latest shell spec, in function FindFiles(),
when no files were found, it should return EFI_NOT_FOUND.
But current codes don't follow the spec.
This patch is to fix this issue.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
 ShellPkg/Application/Shell/ShellProtocol.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ShellPkg/Application/Shell/ShellProtocol.c b/ShellPkg/Application/Shell/ShellProtocol.c
index 0e5d954..6f29250 100644
--- a/ShellPkg/Application/Shell/ShellProtocol.c
+++ b/ShellPkg/Application/Shell/ShellProtocol.c
@@ -2507,10 +2507,14 @@ ShellSearchHandle(
         Status = EfiShellFreeFileList(&ShellInfo);
       }
     }
   }
 
+  if (*FileList == NULL || (*FileList != NULL && IsListEmpty(&(*FileList)->Link))) {
+    Status = EFI_NOT_FOUND;
+  }
+
   FreePool(CurrentFilePattern);
   return (Status);
 }
 
 /**
-- 
1.9.5.msysgit.1