Making unix act like the rest of the platforms. It now return zero for the

size if the nsIFile is really a directory.

xpcom/io/nsLocalFileUnix.cpp

@@ -827,6 +827,9 @@ nsLocalFile::GetFileSize(PRInt64 *aFileSize)
     VALIDATE_STAT_CACHE();
     
 	/* XXX autoconf for and use stat64 if available */
+    if( S_ISDIR(mCachedStat.st_mode) )
+		mLL_II2L(0, (PRUint32)0, *aFileSize);
+    else	
 		mLL_II2L(0, (PRUint32)mCachedStat.st_size, *aFileSize);
     return NS_OK;
 }