[TESTSUITE]Use strncpy instead of strcpy in testsuite/gcc.dg/memcmp-1.c

[Renlin Li]

Hi,

In test_driver_memcmp function, I found buf1 and buf2 is not properly
terminated with null character.

In lib_strncmp, strcpy will be called with buf1 and buf2.
The normal implementation of strcpy function has a loop to copy character from source
to destination one by one until a null character is encountered.

If the string is not properly terminated, this will cause the strcpy read/write
memory beyond the boundary.

Here I changed the strcpy into strncpy to constraint the function to visit
legal memory only.

Test Okay without any problem. Okay to commit?

Regard,
Renlin


gcc/testsuite/ChangeLog:

2017-08-30  Renlin Li  <renlin.li@arm.com>

	* gcc.dg/memcmp-1.c (test_strncmp): Use strncpy instead of strcpy.
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