staging: rdma: Use kcalloc instead of kzalloc

Use kcalloc rather than kzalloc when multiplied by size to prevent
integer overflows. This change also makes code nicer to read.
Signed-off-by: Janani Ravichandran <janani.rvchndrn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/hfi1/efivar.c

@@ -83,8 +83,7 @@ static int read_efi_var(const char *name, unsigned long *size,
 	if (!efi_enabled(EFI_RUNTIME_SERVICES))
 		return -EOPNOTSUPP;
 
-	uni_name = kzalloc(sizeof(efi_char16_t) * (strlen(name) + 1),
-			   GFP_KERNEL);
+	uni_name = kcalloc(strlen(name) + 1, sizeof(efi_char16_t), GFP_KERNEL);
 	temp_buffer = kzalloc(EFI_DATA_SIZE, GFP_KERNEL);
 
 	if (!uni_name || !temp_buffer) {