meta-amd: Fix trailing slash warning in 'amd-fpga' recipe

The current 'amd-fpga' recipe leads to constant warning
messages in a bitbake build:

"""
WARNING: Recipe amd-fpga sets S variable with trailing slash,
remove it.
WARNING: Recipe amd-fpga sets B variable with trailing slash,
remove it.
"""

Remove the trailing slash from the recipe to get rid of the
messages.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: Icb262d38f21cd0a08ddc1af01db7db01ddbc97e4
diff --git a/meta-amd/recipes-amd/amd-fpga/amd-fpga.bb b/meta-amd/recipes-amd/amd-fpga/amd-fpga.bb
index 3fcaeaa..32efdde 100644
--- a/meta-amd/recipes-amd/amd-fpga/amd-fpga.bb
+++ b/meta-amd/recipes-amd/amd-fpga/amd-fpga.bb
@@ -10,7 +10,7 @@
 SRC_URI =  "file://fpgardu.sh"
 SRC_URI += "file://LICENSE"
 
-S = "${WORKDIR}/"
+S = "${WORKDIR}"
 
 do_install () {
         install -d ${D}${bindir}