Avoid null pointer dereference in grib_expression_free(). #36
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It seems grib_arguments::expression can be null.
Call stack leading to the crash is as follow. (grib_context.c is modified outside of this pull request. So line numbers may not match there.)
grib_dump -O /home/suzuki/src/eccodes-orig/build/share/eccodes/samples/reduced_gg_pl_48_grib2.tmpl
==673984== Process terminating with default action of signal 11 (SIGSEGV)
==673984== Access not within mapped region at address 0x0
==673984== at 0x4A6B42E: grib_expression_free (grib_expression.c:92)
==673984== by 0x4A6B7AB: grib_arguments_free (grib_expression.c:162)
==673984== by 0x4A6B794: grib_arguments_free (grib_expression.c:161)
==673984== by 0x4A6B794: grib_arguments_free (grib_expression.c:161)
==673984== by 0x4A6B794: grib_arguments_free (grib_expression.c:161)
==673984== by 0x4A6B794: grib_arguments_free (grib_expression.c:161)
==673984== by 0x4A6B794: grib_arguments_free (grib_expression.c:161)
==673984== by 0x494C3AE: destroy (action_class_gen.c:212)
==673984== by 0x494AC7B: grib_action_delete (action.c:127)
==673984== by 0x4A20384: grib_context_reset (grib_context.c:798)
==673984== by 0x4A20602: grib_context_delete (grib_context.c:866)
==673984== by 0x4A1F175: eccodes_module_destructor (grib_context.c:375)