hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) 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 multipline alignment]

References

• https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1
• https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3
• https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3
• https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278