Do not call memcpy with NULL src pointer
This fix the following ubsan error
check-62.c:36:2: runtime error: null pointer passed as argument 2, which is declared to never be null
diff --git a/tests/tests-c-compiler/check-src/check-60.c b/tests/tests-c-compiler/check-src/check-60.c
index 23bdac1..f7e84ca 100644
--- a/tests/tests-c-compiler/check-src/check-60.c
+++ b/tests/tests-c-compiler/check-src/check-60.c
@@ -17,7 +17,9 @@
unsigned char *b, *bend;
(void)app_key;
assert(buf_offset + size < sizeof(buf));
- memcpy(buf + buf_offset, buffer, size);
+ if (buffer) {
+ memcpy(buf + buf_offset, buffer, size);
+ }
b = buf + buf_offset;
bend = b + size;
printf("=> [");