Staging: rdma:Delete unnecessary NULL check before calling function "kmem_cache_destroy"

The kmem_cache_destroy() function tests whether its argument is NULL
and then returns immediately.
Thus the NULL check before calling this function is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Yash Shah <yshah1@visteon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/ehca/ehca_av.c

@@ -275,6 +275,5 @@ int ehca_init_av_cache(void)
 
 void ehca_cleanup_av_cache(void)
 {
-	if (av_cache)
-		kmem_cache_destroy(av_cache);
+	kmem_cache_destroy(av_cache);
 }

drivers/staging/rdma/ehca/ehca_cq.c

@@ -393,6 +393,5 @@ int ehca_init_cq_cache(void)
 
 void ehca_cleanup_cq_cache(void)
 {
-	if (cq_cache)
-		kmem_cache_destroy(cq_cache);
+	kmem_cache_destroy(cq_cache);
 }

drivers/staging/rdma/ehca/ehca_main.c

@@ -245,8 +245,7 @@ static void ehca_destroy_slab_caches(void)
 	ehca_cleanup_cq_cache();
 	ehca_cleanup_pd_cache();
 #ifdef CONFIG_PPC_64K_PAGES
-	if (ctblk_cache)
-		kmem_cache_destroy(ctblk_cache);
+	kmem_cache_destroy(ctblk_cache);
 #endif
 }
 

drivers/staging/rdma/ehca/ehca_mrmw.c

@@ -2251,10 +2251,8 @@ int ehca_init_mrmw_cache(void)
 
 void ehca_cleanup_mrmw_cache(void)
 {
-	if (mr_cache)
-		kmem_cache_destroy(mr_cache);
-	if (mw_cache)
-		kmem_cache_destroy(mw_cache);
+	kmem_cache_destroy(mr_cache);
+	kmem_cache_destroy(mw_cache);
 }
 
 static inline int ehca_init_top_bmap(struct ehca_top_bmap *ehca_top_bmap,

drivers/staging/rdma/ehca/ehca_pd.c

@@ -119,6 +119,5 @@ int ehca_init_pd_cache(void)
 
 void ehca_cleanup_pd_cache(void)
 {
-	if (pd_cache)
-		kmem_cache_destroy(pd_cache);
+	kmem_cache_destroy(pd_cache);
 }

drivers/staging/rdma/ehca/ehca_qp.c

@@ -2252,6 +2252,5 @@ int ehca_init_qp_cache(void)
 
 void ehca_cleanup_qp_cache(void)
 {
-	if (qp_cache)
-		kmem_cache_destroy(qp_cache);
+	kmem_cache_destroy(qp_cache);
 }