[Bug] r.geomorphon: Conditional jump or move depends on uninitialised value

[marisn]

Valgrind reports use of unitialized value. Needs to be examined.

==45826== Using Valgrind-3.24.0 and LibVEX; rerun with -h for copyright info
==45826== Command: r.geomorphon elevation=elevation search=36 skip=6 flat=1.0 dist=0.0 comparison=anglev1 forms=test_geomorphons --q
==45826== Parent PID: 45812
==45826==
==45826== Conditional jump or move depends on uninitialised value(s)
==45826== at 0x10BF77: main (main.c:381)
==45826==
==45826== Conditional jump or move depends on uninitialised value(s)
==45826== at 0x10C0DA: main (main.c:386)

[sumitchintanwar]

I have investigated this issue and confirmed that the Valgrind errors originate from uninitialized variable access in r.geomorphon’s main processing loop.

Valgrind testing after the fix reports no remaining uninitialized value errors.

### This issue is addressed in PR #6924.