staging: speakup: Clean up tests if NULL returned on failure

Some functions like kmalloc/kzalloc return NULL on failure.
When NULL represents failure, !x is commonly used.

This was done using Coccinelle:
@@
expression *e;
identifier l1;
@@

e = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\)(...);
...
- e == NULL
+ !e

Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/main.c

@@ -1324,7 +1324,7 @@ static int speakup_allocate(struct vc_data *vc)
 	if (speakup_console[vc_num] == NULL) {
 		speakup_console[vc_num] = kzalloc(sizeof(*speakup_console[0]),
 						  GFP_ATOMIC);
-		if (speakup_console[vc_num] == NULL)
+		if (!speakup_console[vc_num])
 			return -ENOMEM;
 		speakup_date(vc);
 	} else if (!spk_parked)