Rename 'np' variable in centroid_wrapper.pyx

cloomis@shell-ics:windowedCentroid ((1.9.5) *)$ python setup.py build_ext -i
Compiling centroid_wrapper.pyx because it changed.
[1/1] Cythonizing centroid_wrapper.pyx
/software/condaRoot/envs/rubin8-ics/lib/python3.11/site-packages/Cython/Compiler/Main.py:381: FutureWarning: Cython directive 'language_level' not set, using '3str' for now (Py3). This has changed from earlier releases! File: /software/mhs/products/Linux64/ics_mcsActor/1.9.5/python/mcsActor/windowedCentroid/centroid_wrapper.pyx
  tree = Parsing.p_module(s, pxd, full_module_name)

Error compiling Cython file:
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...
                int qual;
                int idnum;


cdef extern from "centroid.h" nogil:
     centroids *centroid(int *image, int n_x, int n_y, int thresh1, int thresh2, double fwhmx, double fwhmy,int boxFind, int boxCent,int *np, int nmin, int maxIt, int verbose)
                                                                                                                                          ^
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centroid_wrapper.pyx:41:138: cdef variable 'np' declared after it is used