Remove redundant type check

.gitignore

@@ -1,3 +1,4 @@
+out
 # build/artifact dirs
 _*
 [Bb]uild*/

src/common/transformations/src/transformations/op_conversions/group_query_attention_decomposition.cpp

@@ -41,7 +41,6 @@ std::shared_ptr<ov::Node> get_dimensions(const std::shared_ptr<ov::op::v3::Shape
                                          const std::vector<int>& dims);
 ov::OutputVector make_split(const ov::Output<ov::Node>& value, int64_t num_splits, int64_t axis);
 ov::OutputVector make_split(const ov::Output<ov::Node>& value, const std::vector<int64_t>& split_lengths, int64_t axis);
-std::shared_ptr<ov::Node> create_minus_inf(const ov::element::Type& T);
 
 ov::pass::GroupQueryAttentionDecomposition::GroupQueryAttentionDecomposition() {
     MATCHER_SCOPE(GroupQeuryAttentionDecomposition);
@@ -191,7 +190,12 @@ ov::OutputVector ov::pass::GroupQueryAttentionDecomposition::decompose(
     auto vert_range = std::make_shared<v0::Unsqueeze>(mask_per_line_node, one);   // 12x1 or 13x1
     auto triu = std::make_shared<v1::Greater>(hori_range, vert_range);            // 12x12 or 13x13
     auto typed_zero = v0::Constant::create(T, ov::Shape{}, {0});
-    auto minus_inf = create_minus_inf(T);
+    // cf. make_attention_mask@src\plugins\intel_gpu\tests\common\subgraphs_builders.hpp
+    std::shared_ptr<ov::Node> minus_inf = nullptr;
+    if (T == ov::element::f32)
+        minus_inf = ov::op::v0::Constant::create(T, ov::Shape{}, {-std::numeric_limits<float>::infinity()});
+    else if (T == ov::element::f16)
+        minus_inf = ov::op::v0::Constant::create(T, ov::Shape{}, {std::numeric_limits<ov::float16>::lowest()});
     auto atten_mask = std::make_shared<v1::Select>(triu, minus_inf, typed_zero);  // 12x12 or 13x13
     auto atten_mask_sliced = std::make_shared<v8::Slice>(atten_mask,
                                                          past_sequence_length,
@@ -309,14 +313,3 @@ ov::OutputVector make_split(const ov::Output<ov::Node>& value, int64_t num_split
 
     return split->outputs();
 }
-
-std::shared_ptr<ov::Node> create_minus_inf(const ov::element::Type& T) {
-    // cf. make_attention_mask@src\plugins\intel_gpu\tests\common\subgraphs_builders.hpp
-    if (T == ov::element::f32) {
-        return ov::op::v0::Constant::create(T, ov::Shape{}, {-std::numeric_limits<float>::infinity()});
-    } else if (T == ov::element::f16) {
-        return ov::op::v0::Constant::create(T, ov::Shape{}, {std::numeric_limits<ov::float16>::lowest()});
-    } else {
-        OPENVINO_THROW("GroupQueryAttention only supports f32 and f16");
-    }
-}