fix: Resolve variable shadowing warnings

Fix cppcheck shadowVariable and shadowArgument warnings by renaming
local variables to avoid conflicts:
- Rename 'ob' to 'prop' in property creation loop in card.cpp
- Rename loop variable 'y_offset' to 'y_off' in conv-yuv-semiplanar.h
- Rename local 'y' to 'y_val' in SMPTE pattern generator in testpat.cpp
- Rename 'is_last' to 'child_is_last' in entry printing in kmsprint.cpp

These changes eliminate naming conflicts while preserving functionality
and improving code clarity.

1 files changed, 3 insertions, 3 deletions

diff --git a/kms++util/src/conv-yuv-semiplanar.h b/kms++util/src/conv-yuv-semiplanar.h
index 3c4eec2..f9d771d 100644
--- a/kms++util/src/conv-yuv-semiplanar.h
+++ b/kms++util/src/conv-yuv-semiplanar.h
@@ -121,10 +121,10 @@ public:
 
 			if (y_offset == 0) {
 				// Fill line buffers
-				for (size_t y_offset = 0; y_offset < v_sub; y_offset++) {
-					auto line = md::submdspan(linebuf, y_offset, md::full_extent);
+				for (size_t y_off = 0; y_off < v_sub; y_off++) {
+					auto line = md::submdspan(linebuf, y_off, md::full_extent);
 					std::span<YUV16> span(line.data_handle(), line.size());
-					generate_line(y_src + y_offset, span);
+					generate_line(y_src + y_off, span);
 				}
 			}