reason for fd<0 for g_open?

I use and implement the key-value file parser on wince. In gkeyfile.c we have some calls of g_open(). The resulting descriptor of g_open sometimes has a negativ sign. This means a succesfull opened file, if less than -1. But the statements "fd < 0" in gkeyfile.c generally cause errors. Is there a reason for  "fd < 0" instead of "fd != -1" according to the exact definition of g_open? For example, in glocalfaile.c, glocalfileoutputstream.c, gmappedfile.c we have the exact query to -1. Would it be possible to change the statements to "fd != -1" in gkeyfile.c? 

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