plugin/ssa_comparison.c: Fix compile errors when SSA_PLUGIN_VERBOSE_LOGGING defined

src/ssa_comparison.c: In function #ssa_db_diff_dump#:
src/ssa_comparison.c:1050: error: #struct ref_count_obj# has no member named #pp_field_tables#
src/ssa_comparison.c:1056: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1060: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1066: error: #struct ref_count_obj# has no member named #pp_field_tables#
src/ssa_comparison.c:1072: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1076: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1082: error: #struct ref_count_obj# has no member named #pp_field_tables#
src/ssa_comparison.c:1088: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1092: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1098: error: #struct ref_count_obj# has no member named #pp_field_tables#
src/ssa_comparison.c:1103: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1109: error: #struct ref_count_obj# has no member named #pp_field_tables#
src/ssa_comparison.c:1114: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1120: error: #struct ref_count_obj# has no member named #pp_field_tables#
src/ssa_comparison.c:1126: error: #struct ref_count_obj# has no member named #pp_tables#
src/ssa_comparison.c:1130: error: #struct ref_count_obj# has no member named #pp_tables#

Reported-by: Lenny Verkovsky <lennyb@mellanox.com>

Signed-off-by: Hal Rosenstock <hal@mellanox.com>