Fix #14485 FP uninitdata with cast (danmar#8209)

Author: chrchr-github

lib/checkuninitvar.cpp

@@ -1243,7 +1243,7 @@ const Token* CheckUninitVar::isVariableUsage(const Token *vartok, const Library&
             return nullptr;
     }
     if (alloc != NO_ALLOC) {
-        if (Token::Match(valueExpr->astParent(), "%comp%|%oror%|&&|?|!"))
+        if (Token::Match(valueExpr->astParent(), "%comp%|%oror%|&&|?|!|%"))
             return nullptr;
         if (Token::Match(valueExpr->astParent(), "%or%|&") && valueExpr->astParent()->isBinaryOp())
             return nullptr;

test/testuninitvar.cpp

@@ -2164,6 +2164,13 @@ class TestUninitVar : public TestFixture {
                        "    return p;\n"
                        "}\n");
         ASSERT_EQUALS("[test.cpp:5:9]: (error) Memory is allocated but not initialized: *p [uninitdata]\n", errout_str());
+
+        checkUninitVar("char* f(size_t nBytes, size_t nAlign) {\n" // #14485
+                       "    char* p = reinterpret_cast<char*>(malloc(nBytes));\n"
+                       "    if ((uintptr_t)p % nAlign != 0) {}\n"
+                       "    return p;\n"
+                       "}\n");
+        ASSERT_EQUALS("", errout_str());
     }
 
     // class / struct..