[newlib-cygwin] libc/sys/rtems/crt0.c: Fix two warnings.

[newlib-cygwin] libc/sys/rtems/crt0.c: Fix two warnings.

[Joel Sherrill]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=59584ff16b67e9bc34477d94001ba346ba186ffc

commit 59584ff16b67e9bc34477d94001ba346ba186ffc
Author: Joel Sherrill <joel@rtems.org>
Date:   Mon Jun 14 16:31:08 2021 -0500

    libc/sys/rtems/crt0.c: Fix two warnings.
    
            __assert_func() is marked as noreturn and stub should not.
            __tls_get_addr() needed to return a value..

Diff:
---
 newlib/libc/sys/rtems/crt0.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/newlib/libc/sys/rtems/crt0.c b/newlib/libc/sys/rtems/crt0.c
index 6b8b5f98f..3b131d9c4 100644
--- a/newlib/libc/sys/rtems/crt0.c
+++ b/newlib/libc/sys/rtems/crt0.c
@@ -195,13 +195,13 @@ RTEMS_STUB(void *, _malloc_r(struct _reent * r, size_t s), { return 0; })
 RTEMS_STUB(void, _free_r(struct _reent *r, void *p), { })
 
 /* stubs for functions required by libc/stdlib */
-RTEMS_STUB(void, __assert_func(const char *file, int line, const char *func, const char *failedexpr), { })
+RTEMS_STUB(void, __assert_func(const char *file, int line, const char *func, const char *failedexpr), { while (1) ;})
 
 #if defined(__arm__)
 RTEMS_STUB(void, __aeabi_read_tp(void), { })
 #endif
 
-RTEMS_STUB(void *, __tls_get_addr(const void *ti), { })
+RTEMS_STUB(void *, __tls_get_addr(const void *ti), { return NULL; })
 
 /* The PowerPC expects certain symbols to be defined in the linker script. */