Remove unnecessary check

[radarhere]

In Image.merge(),

Pillow/src/PIL/Image.py

Line 3792 in 6c06fa2

if getmodebands(mode) != len(bands) or "*" in mode:

"*" in mode is redundant.

getmodebands(mode) has to be run first for the other condition to matter, and

Pillow/src/PIL/Image.py

Lines 310 to 318 in 6c06fa2

	def getmodebands(mode: str) -> int:
	"""
	Gets the number of individual bands for this mode.
	:param mode: Input mode.
	:returns: The number of bands in this mode.
	:exception KeyError: If the input mode was not a standard mode.
	"""
	return len(ImageMode.getmode(mode).bands)

none of the modes in ImageMode contain an asterisk.

So with or without this check,

from PIL import Image
Image.merge("RGB;*", [])

gives

Traceback (most recent call last):
  File "demo.py", line 2, in <module>
    Image.merge("RGB;*", [])
  File "PIL/Image.py", line 3792, in merge
    if getmodebands(mode) != len(bands) or "*" in mode:
       ^^^^^^^^^^^^^^^^^^
  File "PIL/Image.py", line 318, in getmodebands
    return len(ImageMode.getmode(mode).bands)
               ^^^^^^^^^^^^^^^^^^^^^^^
  File "PIL/ImageMode.py", line 84, in getmode
    type_str = mapping_modes[mode]
               ~~~~~~~~~~~~~^^^^^^
KeyError: 'RGB;*'

[akx]

LGTM.

This code was already in pil-1.1.1 (the oldest commit I have in my grafted history), and I can't quickly see any reference to asterisk-endowed modes there, so who knows what this was meant to do :)