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

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>

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 */