MAINT: remove some unnecessary use of the Python C API in _pywt.pyx
MAINT: remove some unnecessary use of the Python C API in _pywt.pyx

kwohlfahrt/pywt,rgommers/pywt,kwohlfahrt/pywt,eriol/pywt,kwohlfahrt/pywt,Dapid/pywt,eriol/pywt,rgommers/pywt,PyWavelets/pywt,aaren/pywt,ThomasA/pywt,PyWavelets/pywt,ThomasA/pywt,rgommers/pywt,michelp/pywt,ThomasA/pywt,michelp/pywt,Dapid/pywt,eriol/pywt,grlee77/pywt,michelp/pywt,rgommers/pywt,aaren/pywt,grlee77/pywt,Dapid/pywt,aaren/pywt