blobs/*: Fix extract script (#792)

Command returns a list of utilities found. This can happen if multiple
coreboot folders are present.

Use only one to fix a crash in the following lines.

Test: Being able to extract blobs when two coreboot folders are present,
      both containing an IFDTOOL.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>

blobs/t420/extract.sh

@@ -28,15 +28,15 @@ while getopts ":f:m:i:" opt; do
 done
 
 if [ -z "$MECLEAN" ]; then
-  MECLEAN=`command -v $BLOBDIR/../../build/coreboot-*/util/me_cleaner/me_cleaner.py 2>&1`
+  MECLEAN=`command -v $BLOBDIR/../../build/coreboot-*/util/me_cleaner/me_cleaner.py 2>&1|head -n1`
   if [ -z "$MECLEAN" ]; then
     echo "me_cleaner.py required but not found or specified with -m. Aborting."
     exit 1;
   fi
 fi
 
 if [ -z "$IFDTOOL" ]; then
-  IFDTOOL=`command -v $BLOBDIR/../../build/coreboot-*/util/ifdtool/ifdtool 2>&1`
+  IFDTOOL=`command -v $BLOBDIR/../../build/coreboot-*/util/ifdtool/ifdtool 2>&1|head -n1`
   if [ -z "$IFDTOOL" ]; then
     echo "ifdtool required but not found or specified with -m. Aborting."
     exit 1;

blobs/x220/extract.sh

@@ -28,15 +28,15 @@ while getopts ":f:m:i:" opt; do
 done
 
 if [ -z "$MECLEAN" ]; then
-  MECLEAN=`command -v $BLOBDIR/../../build/coreboot-*/util/me_cleaner/me_cleaner.py 2>&1`
+  MECLEAN=`command -v $BLOBDIR/../../build/coreboot-*/util/me_cleaner/me_cleaner.py 2>&1|head -n1`
   if [ -z "$MECLEAN" ]; then
     echo "me_cleaner.py required but not found or specified with -m. Aborting."
     exit 1;
   fi
 fi
 
 if [ -z "$IFDTOOL" ]; then
-  IFDTOOL=`command -v $BLOBDIR/../../build/coreboot-*/util/ifdtool/ifdtool 2>&1`
+  IFDTOOL=`command -v $BLOBDIR/../../build/coreboot-*/util/ifdtool/ifdtool 2>&1|head -n1`
   if [ -z "$IFDTOOL" ]; then
     echo "ifdtool required but not found or specified with -m. Aborting."
     exit 1;