commit 9781a37002 changed the expected
results for mbrlen in case of passing n=0 to -2. The initialization of
tst_mbrlen_loc and tst_mbrtowc should be updated accordingly.
* tests-mbwc/dat_mbrlen.c (tst_mbrlen_loc): Change expected
result to -2 in case of n == 0.
* tests-mbwc/tst_mbrtowc.c (tst_mbrtowc): Check result against
-2 instead of 0.
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