fpga: altera-pr-ip: fix unsigned comparison with less than zero

stable inclusion
from stable-v5.10.137
commit 474f12deaa19a1358e2f81190fc38063adbfdd20
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60PLB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=474f12deaa19a1358e2f81190fc38063adbfdd20

--------------------------------

[ Upstream commit 2df84a75 ]

Fix the "comparison with less than zero" warning reported by
cppcheck for the unsigned (size_t) parameter count of the
alt_pr_fpga_write() function.

Fixes: d201cc17 ("fpga pr ip: Core driver support for Altera Partial Reconfiguration IP")
Reviewed-by: NTom Rix <trix@redhat.com>
Acked-by: NXu Yilun <yilun.xu@intel.com>
Signed-off-by: NMarco Pagani <marpagan@redhat.com>
Link: https://lore.kernel.org/r/20220609140520.42662-1-marpagan@redhat.comSigned-off-by: NXu Yilun <yilun.xu@intel.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>

drivers/fpga/altera-pr-ip-core.c

@@ -108,7 +108,7 @@ static int alt_pr_fpga_write(struct fpga_manager *mgr, const char *buf,
 	u32 *buffer_32 = (u32 *)buf;
 	size_t i = 0;
 
-	if (count <= 0)
+	if (!count)
 		return -EINVAL;
 
 	/* Write out the complete 32-bit chunks */