C2VdaBqBlockPool: Remove unneeded check in fetchGraphicBlock()

Originally when changing resolution, C2VDAComponent would fetch all the
output buffers before recycling them. Then C2VdaBqBlockPool checks if
the managed buffers count is equal to the requested count when the
fetched buffers are recycled.

Now V4L2DecodeComponent doesn't fetch all the output buffers first.
The check becomes meaningless. This CL removes the check to fix the
e2e test.

Bug: 161499716
Test: pass tast.arc.VideoDecodeAccel.h264_vm
Change-Id: I3d55ae4349758531a8aa472ce339d44d2e955542
diff --git a/plugin_store/C2VdaBqBlockPool.cpp b/plugin_store/C2VdaBqBlockPool.cpp
index 2c98ce0..035134b 100644
--- a/plugin_store/C2VdaBqBlockPool.cpp
+++ b/plugin_store/C2VdaBqBlockPool.cpp
@@ -455,9 +455,6 @@
             ALOG_ASSERT(mAllocateBuffersLock.owns_lock());
             mAllocateBuffersLock.unlock();
         }
-    } else if (mSlotAllocations.size() < mBuffersRequested) {
-        ALOGE("failed to allocate enough buffers");
-        return C2_NO_MEMORY;
     }
 
     // Reset spare dequeue delay time once we have dequeued a working buffer.