CVE-2021-47386

In the Linux kernel, the following vulnerability has been resolved: hwmon:
(w83791d) Fix NULL pointer dereference by removing unnecessary structure
field If driver read val value sufficient for (val & 0x08) && (!(val &
0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer
dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same
literals mean same numbers) Also lm75[] does not serve a purpose anymore
after switching to devm_i2c_new_dummy_device() in
w83791d_detect_subclients(). The patch fixes possible NULL pointer
dereference by removing lm75[]. Found by Linux Driver Verification project
(linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed
multi-line alignment]