* gdb.base/callfuncs.c (main): Assign malloc's return value

	* gdb.base/callfuncs.c (main): Assign malloc's return value
	and free it afterwards.
	* gdb.base/charset-malloc.c (malloc_stub): Likewise.
	* gdb.base/printcmds.c (main): Likewise.
	* gdb.base/randomize.c (main): Free "p" and change breakpoint
	marker position.
	* gdb.base/setvar.c (dummy): Assign malloc's return value
	and free it afterwards.