Fix: Address various compiler warnings

- ggml/src/ggml.c:
  - Remove braces around scalar initializer for `sq_info`.
  - Explicitly initialize the `padding` field.
- ggml/src/ggml-cpu/ggml-cpu.c:
  - Change `src1_segment_prepared_data` to `const void *` to fix assignment discards 'const' qualifier warning.

Author: google-labs-jules[bot]

ggml/src/ggml-cpu/ggml-cpu.c

@@ -8699,7 +8699,7 @@ static void ggml_compute_forward_mul_mat_one_chunk(
                     // Prepare corresponding segment of src1
                     const float * src1_segment_f32_ptr = (const float *)(src1_row_ptr_base + col_segment_start_in_src0 * sizeof(float)); // nb10 for src1
 
-                    void * src1_segment_prepared_data;
+                    const void * src1_segment_prepared_data; // Changed to const void *
                     char  src1_quantized_segment_buffer[GGML_MAX_BLOCK_SIZE]; // Max possible size for a block
 
                     if (src1->type == GGML_TYPE_F32) {

ggml/src/ggml.c

@@ -1616,7 +1616,8 @@ static struct ggml_tensor * ggml_new_tensor_impl(
         /*.data         =*/ obj_alloc_size > 0 ? (void *)(result + 1) : data,
         /*.name         =*/ { 0 },
         /*.extra        =*/ NULL,
-        /*.padding      =*/ { 0 },
+        /*.sq_info      =*/ NULL, // Initialize SmarterQuant info pointer
+        /*.padding      =*/ { 0 }  // Explicitly initialize padding
     };
 
     // TODO: this should not be needed as long as we don't rely on aligned SIMD loads