[ gaussian_deviate.c ] Rename user_data -> private_data for consistency

Author: steinhh

setup.py

@@ -146,7 +146,7 @@ def read_readme():
     # Version 5 introduced fmpfit
     # Version 5.2 introduces xerror_scipy (different handling of bounded params)
     # Version 6 changed name to ftoolss (ftools, Stein's) for publishing to PiPY
-    version="6.0.28",
+    version="6.0.29",
     description="Small C extensions for local image filters (fmedian, fsigma)",
     long_description=read_readme(),
     long_description_content_type="text/markdown",

src/ftoolss/fmpfit/gaussian_deviate.c

@@ -47,9 +47,9 @@ struct GD_STRUCT_NAME
  * Parameters: p[0] = amplitude, p[1] = mean, p[2] = sigma
  */
 int GD_FUNC_NAME(int m, int n, gd_real *p, gd_real *deviates,
-                 gd_real **derivs, void *user_data)
+                 gd_real **derivs, void *private_data)
 {
-  struct GD_STRUCT_NAME *pdata = (struct GD_STRUCT_NAME *)user_data;
+  struct GD_STRUCT_NAME *pdata = (struct GD_STRUCT_NAME *)private_data;
   int i;
   gd_real amp, mean, sigma;
   (void)n; /* Suppress unused parameter warning */