dwarf: Fix warning about -Wmaybe-uninitialized.
dwarf: Fix warning about -Wmaybe-uninitialized.

```
src/dwarf/Gfind_proc_info-lsb.c:536:16: warning: 'eh_frame' may be used uninitialized in this function [-Wmaybe-uninitialized]
   Elf_W (Addr) eh_frame;
                ^
```

Introduced-in: 25413c729a89a89f14273528fa0d2c72489f5c31

djwatson/libunwind,frida/libunwind,djwatson/libunwind,rantala/libunwind,yuyichao/libunwind,djwatson/libunwind,unkadoug/libunwind,vtjnash/libunwind,libunwind/libunwind,libunwind/libunwind,vtjnash/libunwind,libunwind/libunwind,unkadoug/libunwind,frida/libunwind,yuyichao/libunwind,rantala/libunwind,rantala/libunwind,vtjnash/libunwind,unkadoug/libunwind,frida/libunwind,yuyichao/libunwind