Merge pilot.blaudden:/home/msvensson/mysql/yassl_import/my50-yassl_import

into  pilot.blaudden:/home/msvensson/mysql/mysql-5.0-maint

extra/yassl/src/ssl.cpp

@@ -58,6 +58,9 @@ int read_file(SSL_CTX* ctx, const char* file, int format, CertType type)
     if (format != SSL_FILETYPE_ASN1 && format != SSL_FILETYPE_PEM)
         return SSL_BAD_FILETYPE;
 
+    if (file == NULL || !file[0])
+      return SSL_BAD_FILE;
+
     FILE* input = fopen(file, "rb");
     if (!input)
         return SSL_BAD_FILE;