Loss in precision from GGA parsing

[kknives]

The following test:

R24-Test-NMEA0183-Parser/tests/test_parsing.c

Lines 6 to 18 in ce16573

	void test_gga_parsing_over_examples(void) {
	const char* examples[] = {
	"$GPGGA,002153.000,3342.6618,N,11751.3858,W,1,10,1.2,27.0,M,-34.2,M,,0000*5E"};
	gps_t handle = gps_init();
	TEST_ASSERT_EQUAL(GPS_NO_ERROR, gps_update(handle, examples[0], strlen(examples[0])));
	int latlon_degmins[2];
	int latlon_minfracs[2];
	gps_get_lat_lon(handle, latlon_degmins, latlon_minfracs);
	TEST_ASSERT_EQUAL(3342, latlon_degmins[0]);
	TEST_ASSERT_EQUAL(6618, latlon_minfracs[0]);
	TEST_ASSERT_EQUAL(11751, latlon_degmins[1]);
	TEST_ASSERT_EQUAL(3858, latlon_minfracs[1]);
	}

Fails with the output:

$ ./test_parsing.out
test_parsing.c:17:test_gga_parsing_over_examples:FAIL: Expected 3858 Was 3857
                                                                                                                                                                                              
-----------------------
1 Tests 1 Failures 0 Ignored
FAIL

There is a loss in precision after parsing the sentence: the sentence provided has the longitude minutes different from the one returned by gps_get_lat_lon.

Find the cause and a way to fix this, so that the test passes. In addition, try out other values to make sure that this bug never occurs again.