evas/filter: Avoid leak in error path

If format is not found we go out of scope and would leak param. Free instead.

CID 1308610

src/lib/evas/filters/evas_filter_parser.c

@@ -401,6 +401,7 @@ _instruction_param_addv(Evas_Filter_Instruction *instr, const char *name,
         break;
       case VT_NONE:
       default:
+        free(param);
         return EINA_FALSE;
      }
    param->allow_seq = sequential;