Bug#37402: Mysql cant read partitioned table with capital letter in the name

Post push fix (compiler warning)

sql/ha_partition.cc:
  Bug#37402: Mysql cant read partitioned table with capital letter in the name
  
  fix to prevent a compiler warning.

sql/ha_partition.cc

@@ -1798,7 +1798,8 @@ uint ha_partition::del_ren_cre_table(const char *from,
   char from_buff[FN_REFLEN], to_buff[FN_REFLEN], from_lc_buff[FN_REFLEN],
        to_lc_buff[FN_REFLEN];
   char *name_buffer_ptr;
-  const char *from_path, *to_path;
+  const char *from_path;
+  const char *to_path= NULL;
   uint i;
   handler **file, **abort_file;
   DBUG_ENTER("del_ren_cre_table()");