Fix HoughLinesP edge case handling #218

Job	Run time
Build rustVX (main)	1m 28s
Build Khronos OpenVX sample	48s
build	1m 56s
graph	8s
vision-filters	55s
vision-color	14s
KHR extension: pipelining fast	13s
baseline	12s
data-objects	9s
KHR extension: pipelining stress	36s
Enhanced-Vision: Advanced Filtering	59s
vision-features	17s
vision-pyramid	14s
vision-arithmetic	28s
KHR extension: user-data-object	13s
vision-statistics	14s
image-ops	8s
vision-geometric	31s
Enhanced-Vision: Control Flow	12s
Enhanced-Vision: Post-Processing	14s
Enhanced-Vision: Feature Extraction	8s
Perf gate (PR vs main)	7m 7s
Enhanced-Vision: Tensor Transforms	7s
Enhanced-Vision: Tensor Arithmetic	8s
Benchmark & compare (rustVX vs Khronos sample)	5m 45s
Perf gate (PR vs main)	5m 9s
Build Khronos OpenVX sample	48s
vision-geometric	31s
Enhanced-Vision: Control Flow	12s
image-ops	8s
vision-arithmetic	28s
Enhanced-Vision: Tensor Arithmetic	8s
vision-pyramid	14s
vision-statistics	14s
data-objects	9s
KHR extension: pipelining stress	36s
vision-color	14s
Enhanced-Vision: Tensor Transforms	7s
graph	8s
vision-filters	55s
vision-features	17s
Enhanced-Vision: Feature Extraction	8s
baseline	12s
Enhanced-Vision: Post-Processing	14s
KHR extension: pipelining fast	13s
Enhanced-Vision: Advanced Filtering	59s
KHR extension: user-data-object	13s
Benchmark & compare (rustVX vs Khronos sample)	5m 45s
build	1m 56s
Build rustVX (main)	1m 28s
	44m 50s

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