target: Delete error messages for failed memory allocations

The script "checkpatch.pl" pointed information out like the following.

WARNING: Possible unnecessary 'out of memory' message

Thus remove such statements here.

Link: http://events.linuxfoundation.org/sites/events/files/slides/LCJ16-Refactor_Strings-WSang_0.pdfSigned-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_rd.c

@@ -48,10 +48,8 @@ static int rd_attach_hba(struct se_hba *hba, u32 host_id)
 	struct rd_host *rd_host;
 
 	rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL);
-	if (!rd_host) {
-		pr_err("Unable to allocate memory for struct rd_host\n");
+	if (!rd_host)
 		return -ENOMEM;
-	}
 
 	rd_host->rd_host_id = host_id;
 
@@ -148,11 +146,8 @@ static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *
 
 		sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg),
 				GFP_KERNEL);
-		if (!sg) {
-			pr_err("Unable to allocate scatterlist array"
-				" for struct rd_dev\n");
+		if (!sg)
 			return -ENOMEM;
-		}
 
 		sg_init_table(sg, sg_per_table + chain_entry);
 
@@ -211,11 +206,8 @@ static int rd_build_device_space(struct rd_dev *rd_dev)
 
 	sg_tables = (total_sg_needed / max_sg_per_table) + 1;
 	sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
-	if (!sg_table) {
-		pr_err("Unable to allocate memory for Ramdisk"
-		       " scatterlist tables\n");
+	if (!sg_table)
 		return -ENOMEM;
-	}
 
 	rd_dev->sg_table_array = sg_table;
 	rd_dev->sg_table_count = sg_tables;
@@ -271,11 +263,8 @@ static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block
 
 	sg_tables = (total_sg_needed / max_sg_per_table) + 1;
 	sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
-	if (!sg_table) {
-		pr_err("Unable to allocate memory for Ramdisk protection"
-		       " scatterlist tables\n");
+	if (!sg_table)
 		return -ENOMEM;
-	}
 
 	rd_dev->sg_prot_array = sg_table;
 	rd_dev->sg_prot_count = sg_tables;
@@ -297,10 +286,8 @@ static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name)
 	struct rd_host *rd_host = hba->hba_ptr;
 
 	rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL);
-	if (!rd_dev) {
-		pr_err("Unable to allocate memory for struct rd_dev\n");
+	if (!rd_dev)
 		return NULL;
-	}
 
 	rd_dev->rd_host = rd_host;