Fixes GCC 8 warning:
dll/win32/mshtml/script.c:844:4: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
if(!new_buf)
^~
dll/win32/mshtml/script.c:846:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
This->size <<= 1;
^~~~