hipBindTexture() should handle nullptr offset.

If a user passes a ptr that was allocated by hipMalloc(), the offset is guaranteed to be 0 and NULL may be passed as the offset parameter. We shouldn't return an error in this case.

Change-Id: I4a8d645121e5a17d5e2861a0629356a3599de9ee

vdi/hip_texture.cpp

@@ -388,8 +388,7 @@ hipError_t ihipBindTexture(size_t* offset,
                            const hipChannelFormatDesc* desc,
                            size_t size,
                            hipTextureReadMode readMode) {
-  if ((offset == nullptr) ||
-      (texref == nullptr) ||
+  if ((texref == nullptr) ||
       (devPtr == nullptr) ||
       (desc == nullptr)) {
     return hipErrorInvalidValue;
@@ -426,8 +425,7 @@ hipError_t ihipBindTexture2D(size_t* offset,
                              size_t height,
                              size_t pitch,
                              hipTextureReadMode readMode) {
-  if ((offset == nullptr) ||
-      (texref == nullptr) ||
+  if ((texref == nullptr) ||
       (devPtr == nullptr) ||
       (desc == nullptr)) {
     return hipErrorInvalidValue;