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++/src/card.cpp b/kms++/src/card.cpp
index c26e4f2..f67f8f8 100644
--- a/kms++/src/card.cpp
+++ b/kms++/src/card.cpp
@@ -269,9 +269,9 @@ void Card::setup()
 			uint32_t prop_id = props->props[i];
 
 			if (m_obmap.find(prop_id) == m_obmap.end()) {
-				auto ob = new Property(*this, prop_id);
-				m_obmap[prop_id] = ob;
-				m_properties.push_back(ob);
+				auto prop = new Property(*this, prop_id);
+				m_obmap[prop_id] = prop;
+				m_properties.push_back(prop);
 			}
 		}