Issue #371: fix parsing of "-Infinity" (although in a somewhat different location than PR#372 used), and add a case to test_parse to check for this.

json_tokener.c

@@ -767,6 +767,7 @@ struct json_object* json_tokener_parse_ex(struct json_tokener *tok,
 	    (c == 'i' || c == 'I'))
 	{
 		state = json_tokener_state_inf;
+		tok->st_pos = 0;
 		goto redo_char;
 	}
       }

tests/test_parse.c

@@ -57,6 +57,7 @@ static void test_basic_parse()
 	single_basic_parse("infinity", 0);
 	single_basic_parse("-Infinity", 0);
 	single_basic_parse("-infinity", 0);
+	single_basic_parse("{ \"min\": Infinity, \"max\": -Infinity}", 0);
 
 	single_basic_parse("Infinity!", 0);
 	single_basic_parse("Infinitynull", 0);

tests/test_parse.expected

@@ -14,6 +14,7 @@ new_obj.to_string(Infinity)=Infinity
 new_obj.to_string(infinity)=Infinity
 new_obj.to_string(-Infinity)=-Infinity
 new_obj.to_string(-infinity)=-Infinity
+new_obj.to_string({ "min": Infinity, "max": -Infinity})={ "min": Infinity, "max": -Infinity }
 new_obj.to_string(Infinity!)=Infinity
 new_obj.to_string(Infinitynull)=Infinity
 new_obj.to_string(InfinityXXXX)=Infinity