selftests/core: fix conflicting types compile error for close_range()

close_range() test type conflicts with close_range() library call in
x86_64-linux-gnu/bits/unistd_ext.h. Fix it by changing the name to
core_close_range().

gcc -g -I../../../../usr/include/ close_range_test.c -o ../tools/testing/selftests/core/close_range_test
In file included from close_range_test.c:16:
close_range_test.c:57:6: error: conflicting types for ‘close_range’; have ‘void(struct __test_metadata *)’
57 | TEST(close_range)
| ^~~~~~~~~~~
../kselftest_harness.h:181:21: note: in definition of macro ‘__TEST_IMPL’
181 | static void test_name(struct __test_metadata *_metadata); \
| ^~~~~~~~~
close_range_test.c:57:1: note: in expansion of macro ‘TEST’
57 | TEST(close_range)
| ^~~~
In file included from /usr/include/unistd.h:1204,
from close_range_test.c:13:
/usr/include/x86_64-linux-gnu/bits/unistd_ext.h:56:12: note: previous declaration of ‘close_range’ with type ‘int(unsigned int, unsigned int, int)’
56 | extern int close_range (unsigned int __fd, unsigned int __max_fd,
| ^~~~~~~~~~~

Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/core/close_range_test.c

···
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 #endif
 
-TEST(close_range)
+TEST(core_close_range)
 {
 	int i, ret;
 	int open_fds[101];