qemu-iotests: get rid of $iam

The variable is almost unused, and one of the two uses is actually
uninitialized.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/check

@@ -30,12 +30,9 @@ interrupt=true
 # by default don't output timestamps
 timestamp=${TIMESTAMP:=false}
 
-# generic initialization
-iam=check
-
 _init_error()
 {
-    echo "$iam: $1" >&2
+    echo "check: $1" >&2
     exit 1
 }
 

tests/qemu-iotests/common.rc

@@ -43,7 +43,7 @@ poke_file()
 
 if ! . ./common.config
     then
-    echo "$iam: failed to source common.config"
+    echo "$0: failed to source common.config"
     exit 1
 fi