[Offload] Print Image location rather than casting it (llvm#160309)

This squishes a warning where the runtime tries to bind a StringRef to
a `%p`.

Author: RossBrunton

offload/plugins-nextgen/common/src/PluginInterface.cpp

@@ -1984,7 +1984,8 @@ int32_t GenericPluginTy::supports_empty_images() {
 int32_t GenericPluginTy::isPluginCompatible(StringRef Image) {
   auto HandleError = [&](Error Err) -> bool {
     [[maybe_unused]] std::string ErrStr = toString(std::move(Err));
-    DP("Failure to check validity of image %p: %s", Image, ErrStr.c_str());
+    DP("Failure to check validity of image %p: %s", Image.data(),
+       ErrStr.c_str());
     return false;
   };
   switch (identify_magic(Image)) {
@@ -2012,7 +2013,8 @@ int32_t GenericPluginTy::isPluginCompatible(StringRef Image) {
 int32_t GenericPluginTy::isDeviceCompatible(int32_t DeviceId, StringRef Image) {
   auto HandleError = [&](Error Err) -> bool {
     [[maybe_unused]] std::string ErrStr = toString(std::move(Err));
-    DP("Failure to check validity of image %p: %s", Image, ErrStr.c_str());
+    DP("Failure to check validity of image %p: %s", Image.data(),
+       ErrStr.c_str());
     return false;
   };
   switch (identify_magic(Image)) {