Bug#30695: An apostrophe ' in the comment of the ADD PARTITION

    causes the Server to crash.

Post-pushbuild fix

Pushbuild genereted valgrind warnings.

Changed function to safer variant.

sql/sql_partition.cc

@@ -1866,7 +1866,7 @@ static int add_quoted_string(File fptr, const char *quotestr)
   String escapedstr;
   int err= add_string(fptr, "'");
   err+= append_escaped(&escapedstr, &orgstr);
-  err+= add_string(fptr, escapedstr.c_ptr());
+  err+= add_string(fptr, escapedstr.c_ptr_safe());
   return err + add_string(fptr, "'");
 }