CVE-2025-37937 objtool, media: dib8000: Prevent divide-by-zero in dib8000_set_dds()

In the Linux kernel, the following vulnerability has been resolved: objtool, media: dib8000: Prevent divide-by-zero in dib8000setdds If dib8000setdds's call to dib8000read32 returns zero, the result is a divide-by-zero. Prevent that from happening. Fixes the following warning with an UBSAN kernel...