Use delete[] to de-allocate pointers from new[]

Upstream clang has a new diagnostic, '-Wmismatched-new-delete' to
generate a warning (that becomes an error with -Werror) when delete is
used to deallocate pointers created with 'new[]'.  This patch fixes
'delete's that trigger this warning/error.

Change-Id: Id7b6f6c2df3e860e576de55e2f61f3d2be3a3986
diff --git a/tests/buffer_tests.cpp b/tests/buffer_tests.cpp
index 4967382..7d830bb 100644
--- a/tests/buffer_tests.cpp
+++ b/tests/buffer_tests.cpp
@@ -256,7 +256,7 @@
       VerifyFencepost(&buf_align[len]);
     }
   }
-  delete buf;
+  delete[] buf;
 }
 
 void RunSrcDstBufferAlignTest(
@@ -292,8 +292,8 @@
       VerifyFencepost(&dst_align[len]);
     }
   }
-  delete src;
-  delete dst;
+  delete[] src;
+  delete[] dst;
 }
 
 void RunCmpBufferAlignTest(
@@ -344,8 +344,8 @@
       }
     }
   }
-  delete buf1;
-  delete buf2;
+  delete[] buf1;
+  delete[] buf2;
 }
 
 void RunSingleBufferOverreadTest(void (*test_func)(uint8_t*, size_t)) {
@@ -389,7 +389,7 @@
   }
   ASSERT_TRUE(mprotect(&memory[pagesize], pagesize, PROT_READ | PROT_WRITE) == 0);
   free(memory);
-  delete dst;
+  delete[] dst;
 }
 
 void RunCmpBufferOverreadTest(