RGBMatrix: fix memoryview(matrix) #4501
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Typical test:
```python
import displayio
import rgbmatrix
import board
displayio.release_displays()
matrix = rgbmatrix.RGBMatrix(
width=128, bit_depth=4,
rgb_pins=[board.GP0, board.GP1, board.GP2, board.GP3, board.GP4, board.GP5],
addr_pins=[board.GP6, board.GP7, board.GP8, board.GP9],
clock_pin=board.GP10, latch_pin=board.GP11, output_enable_pin=board.GP12)
mem = memoryview(matrix)
mem[0] = 65535 # OK
mem[0] = 65536 # errors (out of range)
```
dhalbert
approved these changes
Mar 29, 2021
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Typical test:
Prior to this change, the line
mem = memoryview(matrix)would raise aValueError: bad typecode