llext: remove a superfluous variable initialisation

ret in llext_load() is always assigned before use, remove its
redundant initialisation.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

subsys/llext/llext.c

@@ -635,7 +635,7 @@ out:
 
 int llext_load(struct llext_loader *ldr, const char *name, struct llext **ext)
 {
-	int ret = 0;
+	int ret;
 	elf_ehdr_t ehdr;
 
 	ret = llext_seek(ldr, 0);