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Make M_FileExists work on directories.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 949

--- a/src/m_misc.c

+++ b/src/m_misc.c

@@ -31,6 +31,7 @@

 #include <stdio.h>

 #include <stdlib.h>

 #include <ctype.h>

+#include <errno.h>

 // for mkdir:

@@ -138,7 +139,10 @@

     }

     else

     {

-        return false;

+        // If we can't open because the file is a directory, the 

+        // "file" exists at least!

+

+        return errno == EISDIR;

     }

 }