buffer_cache: Minor fixes

Loop through the tmp_intervals by reference, rather than by copy, and fix gl clear buffer size calculation.

src/video_core/buffer_cache/buffer_cache.h

@@ -570,13 +570,12 @@ bool BufferCache<P>::DMACopy(GPUVAddr src_address, GPUVAddr dest_address, u64 am
     ForEachWrittenRange(*cpu_src_address, amount, mirror);
     // This subtraction in this order is important for overlapping copies.
     common_ranges.subtract(subtract_interval);
-    bool atleast_1_download = tmp_intervals.size() != 0;
-    for (const IntervalType add_interval : tmp_intervals) {
+    const bool has_new_downloads = tmp_intervals.size() != 0;
+    for (const IntervalType& add_interval : tmp_intervals) {
         common_ranges.add(add_interval);
     }
-
     runtime.CopyBuffer(dest_buffer, src_buffer, copies);
-    if (atleast_1_download) {
+    if (has_new_downloads) {
         dest_buffer.MarkRegionAsGpuModified(*cpu_dest_address, amount);
     }
     std::vector<u8> tmp_buffer(amount);

src/video_core/renderer_opengl/gl_buffer_cache.cpp

@@ -147,8 +147,7 @@ void BufferCacheRuntime::CopyBuffer(Buffer& dst_buffer, Buffer& src_buffer,
 
 void BufferCacheRuntime::ClearBuffer(Buffer& dest_buffer, u32 offset, size_t size, u32 value) {
     glClearNamedBufferSubData(dest_buffer.Handle(), GL_R32UI, static_cast<GLintptr>(offset),
-                              static_cast<GLsizeiptr>(size / sizeof(u32)), GL_RED, GL_UNSIGNED_INT,
-                              &value);
+                              static_cast<GLsizeiptr>(size), GL_RED, GL_UNSIGNED_INT, &value);
 }
 
 void BufferCacheRuntime::BindIndexBuffer(Buffer& buffer, u32 offset, u32 size) {