Ensure consistent error name

Author: rhpvorderman

src/isal/igzip_lib.c

@@ -783,7 +783,7 @@ PyInit_igzip_lib(void)
     if (m == NULL)
         return NULL;
 
-    IsalError = PyErr_NewException("igzip_lib.error", NULL, NULL);
+    IsalError = PyErr_NewException("igzip_lib.IsalError", NULL, NULL);
     Py_XINCREF(IsalError);
     if (PyModule_AddObject(m, "error", IsalError) < 0) {
         Py_XDECREF(IsalError);

src/isal/igzip_lib.pyi

@@ -31,7 +31,7 @@ MEM_LEVEL_SMALL: int
 MEM_LEVEL_MEDIUM: int
 MEM_LEVEL_LARGE: int
 MEM_LEVEL_EXTRA_LARGE: int
-IsalError: OSError
+IsalError: Exception
 
 def compress(data, level: int = ISAL_DEFAULT_COMPRESSION,
              flag: int = COMP_DEFLATE,