Minor lint fixes in Buffer.cc.
Minor lint fixes in Buffer.cc.

jblomer/ramcloud,SMatsushi/RAMCloud,SMatsushi/RAMCloud,utah-scs/RAMCloud,jcarreira/ramcloud,rstutsman/RAMCloud,anirajk/RAMCloud,DavidLi2010/ramcloud,utah-scs/RAMCloud,anirajk/RAMCloud,mrdiegoa/ramcloud,taschik/ramcloud,y-higuchi/ramcloud,anirajk/RAMCloud,behnamm/cs244b_project,mrdiegoa/ramcloud,anirajk/RAMCloud,jblomer/ramcloud,SMatsushi/RAMCloud,matrix207/RAMCloud,taschik/ramcloud-load-manager,behnamm/cs244b_project,taschik/ramcloud-load-manager,QingkaiLu/RAMCloud,taschik/ramcloud-load-manager,DavidLi2010/ramcloud,mrdiegoa/ramcloud,taschik/ramcloud,DavidLi2010/ramcloud,jcarreira/ramcloud,jcarreira/ramcloud,utah-scs/RAMCloud,alexandermerritt/ramcloud,SMatsushi/RAMCloud,IMCG/RamCloud,Frank-Wu/RamCloud,alexandermerritt/ramcloud,matrix207/RAMCloud,behnamm/cs244b_project,Frank-Wu/RamCloud,mrdiegoa/ramcloud,Frank-Wu/RamCloud,behnamm/cs244b_project,jblomer/ramcloud,utah-scs/RAMCloud,utah-scs/RAMCloud,rstutsman/RAMCloud,SMatsushi/RAMCloud,taschik/ramcloud-load-manager,mrdiegoa/ramcloud,y-higuchi/ramcloud,Frank-Wu/RamCloud,y-higuchi/ramcloud,jcarreira/ramcloud,alexandermerritt/ramcloud,rstutsman/RAMCloud,jblomer/ramcloud,y-higuchi/ramcloud,taschik/ramcloud,jblomer/ramcloud,alexandermerritt/ramcloud,QingkaiLu/RAMCloud,SMatsushi/RAMCloud,IMCG/RamCloud,jcarreira/ramcloud,rstutsman/RAMCloud,matrix207/RAMCloud,behnamm/cs244b_project,IMCG/RamCloud,behnamm/cs244b_project,IMCG/RamCloud,DavidLi2010/ramcloud,QingkaiLu/RAMCloud,anirajk/RAMCloud,taschik/ramcloud,taschik/ramcloud,matrix207/RAMCloud,taschik/ramcloud-load-manager,alexandermerritt/ramcloud,IMCG/RamCloud,jcarreira/ramcloud,DavidLi2010/ramcloud,anirajk/RAMCloud,IMCG/RamCloud,DavidLi2010/ramcloud,matrix207/RAMCloud,Frank-Wu/RamCloud,jblomer/ramcloud,matrix207/RAMCloud,QingkaiLu/RAMCloud,QingkaiLu/RAMCloud,alexandermerritt/ramcloud,rstutsman/RAMCloud,Frank-Wu/RamCloud,utah-scs/RAMCloud,y-higuchi/ramcloud,rstutsman/RAMCloud,y-higuchi/ramcloud,QingkaiLu/RAMCloud,mrdiegoa/ramcloud