Commit 5801d558 replaced g_slist_copy_deep() by some incorrect code
that actually leaks the newly allocated memory, instead of doing
a deep copy.
This new version should be more correct, more concise, and it fixes
the following warning:
src/session.c: In function 'sr_packet_copy':
src/session.c:1025:38: warning: passing argument 2 of 'g_slist_foreach' from incompatible pointer type [-Wincompatible-pointer-types]
g_slist_foreach(meta_copy->config, (GCopyFunc)copy_src, NULL);
^
In file included from /usr/include/glib-2.0/glib/gmain.h:26:0,
from /usr/include/glib-2.0/glib/giochannel.h:33,
from /usr/include/glib-2.0/glib.h:54,
from src/session.c:24:
/usr/include/glib-2.0/glib/gslist.h:125:10: note: expected 'GFunc {aka void (*)(void *, void *)}' but argument is of type 'void * (*)(const void *, void *)'
void g_slist_foreach (GSList *list,
^
By avoiding g_slist_copy_deep() for now, we can easily allow libsigrok
to build against glib 2.32 (less hassle for users of stable/older
distros or OSes).
Use g_malloc0() for small allocations and assume they always
succeed. Simplify error handling in a few places accordingly.
Don't always sanity-check parameters for non-public (SR_PRIV)
functions, we require the developers to invoke them correctly.
This allows further error handling simplifications.