irq: Simplify condition in irq_matrix_reserve()

The if condition in irq_matrix_reserve() can be much simpler.

While at it fix a typo in the comment.

Signed-off-by: Juergen Gross <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

kernel/irq/matrix.c

···
  * irq_matrix_reserve - Reserve interrupts
  * @m:		Matrix pointer
  *
- * This is merily a book keeping call. It increments the number of globally
+ * This is merely a book keeping call. It increments the number of globally
  * reserved interrupt bits w/o actually allocating them. This allows to
  * setup interrupt descriptors w/o assigning low level resources to it.
  * The actual allocation happens when the interrupt gets activated.
  */
 void irq_matrix_reserve(struct irq_matrix *m)
 {
-	if (m->global_reserved <= m->global_available &&
-	    m->global_reserved + 1 > m->global_available)
+	if (m->global_reserved == m->global_available)
 		pr_warn("Interrupt reservation exceeds available resources\n");
 
 	m->global_reserved++;