Tom Tromey 17568d782d Remove NULL checks before xfree
A couple of spots in the TUI did a NULL check before an xfree.  This
isn't necessary, and most other cases were removed from gdb a while
ago.

gdb/ChangeLog
2019-06-25  Tom Tromey  <tom@tromey.com>

	* tui/tui-source.c (tui_set_source_content): Don't check before
	xfree.
	* tui/tui-disasm.c (tui_disassemble): Don't check before xfree.
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
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