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, 2 insertions, 2 deletions

diff --git a/utils/kmsprint.cpp b/utils/kmsprint.cpp
index 71bcb70..e51de93 100644
--- a/utils/kmsprint.cpp
+++ b/utils/kmsprint.cpp
@@ -330,9 +330,9 @@ static void print_entry(const Entry& e, const string& prefix, bool is_child, boo
 	}
 
 	for (const Entry& child : e.children) {
-		bool is_last = &child == &e.children.back();
+		bool child_is_last = &child == &e.children.back();
 
-		print_entry(child, prefix2, true, is_last);
+		print_entry(child, prefix2, true, child_is_last);
 	}
 }