test: Fix trivial compiler warning in dlwrap

This mutes compiler warnings for `dlwrap.c` by ensuring we actually check
the return status of the `asprintf` call. At this point in the test suite
our possible failure here is only memory, so we'll abort.

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

test/dlwrap.c

@@ -162,7 +162,11 @@ wrapped_dlsym(const char *prefix, const char *name)
     char *wrap_name;
     void *symbol;
 
-    asprintf(&wrap_name, "override_%s_%s", prefix, name);
+    if (asprintf(&wrap_name, "override_%s_%s", prefix, name) < 0) {
+        fputs("Error: Failed to allocate memory.\n", stderr);
+        abort();
+    }
+
     symbol = dlwrap_real_dlsym(RTLD_DEFAULT, wrap_name);
     free(wrap_name);
     return symbol;