[Compilation Warning Fix] comparison between signed and unsigned integer expressions (#807)
[Compilation Warning Fix] comparison between signed and unsigned integer expressions (#807)

The compilation warning is fixed. 
src/runtime/graph/graph_runtime.cc:392:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   CHECK(data_byte_size == size)
         ~~~~~~~~~~~~~~~^~~~
/mnt/D_DRIVE/work/nnvm_22_Jan/nnvm_latest/tvm/dmlc-core/include/dmlc/logging.h:109:9: note: in definition of macro ‘CHECK’
   if (!(x))                                                \
         ^
dmlc/tvm,Laurawly/tvm-1,tqchen/tvm,Huyuwei/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Huyuwei/tvm,tqchen/tvm,Laurawly/tvm-1,Huyuwei/tvm,dmlc/tvm,Huyuwei/tvm,tqchen/tvm,Laurawly/tvm-1,sxjscience/tvm,dmlc/tvm,dmlc/tvm,sxjscience/tvm,tqchen/tvm,sxjscience/tvm,dmlc/tvm,tqchen/tvm,tqchen/tvm,sxjscience/tvm,sxjscience/tvm,dmlc/tvm,tqchen/tvm,Laurawly/tvm-1,Huyuwei/tvm,sxjscience/tvm,Huyuwei/tvm,sxjscience/tvm,Huyuwei/tvm,dmlc/tvm,Huyuwei/tvm,tqchen/tvm,dmlc/tvm,sxjscience/tvm,Laurawly/tvm-1,tqchen/tvm,sxjscience/tvm,tqchen/tvm,Laurawly/tvm-1,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Huyuwei/tvm