Fix iqk_mul_mat when number of rows is not multiple of repack rows (#911)

Co-authored-by: Iwan Kawrakow <[email protected]>

Author: ikawrakow

ggml/src/iqk/iqk_mul_mat.cpp

@@ -502,7 +502,8 @@ extern "C" IQK_API bool iqk_mul_mat(long Nx, long Ny, long ne00,
 
     auto etypeA = ggml_type(typeA);
     if (auto dequant_type = MulMat::is_dequant_better(etypeA, Ny);
-             dequant_type != etypeA && MulMat::prepare(dequant_type, typeB, ne00, mm, Ny)) {
+             dequant_type != etypeA && MulMat::prepare(dequant_type, typeB, ne00, mm, Ny) &&
+             Nx%MulMat::num_rows(ggml_type(dequant_type)) == 0) {
 
         constexpr int k_x_step = 32;