ClangFormat: apply to source, most of intern

Apply clang format as proposed in T53211.

For details on usage and instructions for migrating branches
without conflicts, see:

https://wiki.blender.org/wiki/Tools/ClangFormat

source/blender/python/gpu/gpu_py_api.h

@@ -21,13 +21,20 @@
 #ifndef __GPU_PY_API_H__
 #define __GPU_PY_API_H__
 
-
 int bpygpu_ParsePrimType(PyObject *o, void *p);
 
 PyObject *BPyInit_gpu(void);
 
 bool bpygpu_is_initialized_or_error(void);
-#define BPYGPU_IS_INIT_OR_ERROR_OBJ if (UNLIKELY(!bpygpu_is_initialized_or_error())) { return NULL; } ((void)0)
-#define BPYGPU_IS_INIT_OR_ERROR_INT if (UNLIKELY(!bpygpu_is_initialized_or_error())) { return -1; } ((void)0)
+#define BPYGPU_IS_INIT_OR_ERROR_OBJ \
+  if (UNLIKELY(!bpygpu_is_initialized_or_error())) { \
+    return NULL; \
+  } \
+  ((void)0)
+#define BPYGPU_IS_INIT_OR_ERROR_INT \
+  if (UNLIKELY(!bpygpu_is_initialized_or_error())) { \
+    return -1; \
+  } \
+  ((void)0)
 
-#endif  /* __GPU_PY_API_H__ */
+#endif /* __GPU_PY_API_H__ */