Fixed two issues found by static analysis

modules/dnn/src/layers/pooling_layer.cpp

@@ -323,6 +323,8 @@ public:
 
 #if CV_SIMD128
             const int* ofsptr = ofsbuf.empty() ? 0 : (const int*)&ofsbuf[0];
+            if (poolingType == MAX && !compMaxIdx && !ofsptr)
+                CV_Error(Error::StsBadArg, "ofsbuf should be initialized in this mode");
             v_float32x4 idx00(0.f, (float)stride_w, (float)(stride_w*2), (float)(stride_w*3));
             v_float32x4 ones = v_setall_f32(1.f);
             v_float32x4 idx_delta = v_setall_f32((float)(inp_width - kernel_w));

modules/imgcodecs/src/grfmt_tiff.cpp

@@ -775,6 +775,7 @@ bool TiffEncoder::writeLibTiff( const std::vector<Mat>& img_vec, const std::vect
             }
             default:
             {
+                TIFFClose(pTiffHandle);
                 return false;
             }
         }