Avoid using a tempfile on every key decryption

A tempfile was often used by Tomb in order to parse the stderr output of
gpg and detect if the password is correct or not. The tempfile was not
holding any secret information (see #162) yet this is an improvement for
Tomb's deniability since there is now much less going on in the temp
firectory.

tomb

@@ -848,6 +848,7 @@ gpg_decrypt() {
     # fix for gpg 1.4.11 where the --status-* options don't work ;^/
     local gpgver=$(gpg --version --no-permission-warning | awk '/^gpg/ {print $3}')
     local gpgpass="$1\n$TOMBKEY"
+    local gpgstatus
 
     [[ $gpgver == "1.4.11" ]] && {
         _verbose "GnuPG is version 1.4.11 - adopting status fix."
@@ -860,19 +861,16 @@ gpg_decrypt() {
     } || { # using status-file in gpg != 1.4.11
 
         # TODO: use mkfifo
-        _tmp_create
-	    statusfile=$TOMBTMP
-
         TOMBSECRET=`print - "$gpgpass" | \
             gpg --batch --passphrase-fd 0 --no-tty --no-options \
             --status-fd 2 --no-mdc-warning --no-permission-warning \
-            --no-secmem-warning 2> $statusfile`
+            --no-secmem-warning` 2>&1 | read -r -d'\n' gpgstatus
 
         unset gpgpass
 
         ret=1
 
-        [[ "${mapfile[$statusfile]}" =~ "DECRYPTION_OKAY" ]] && { ret=0 }
+        [[ "${gpgstatus}" =~ "DECRYPTION_OKAY" ]] && { ret=0 }
 
 
     }
@@ -1372,7 +1370,7 @@ forge_key() {
     # Do not overwrite any files accidentally
     [[ -r "$destkey" ]] && {
         _warning "Forging this key would overwrite an existing file. Operation aborted."
-        ls -lh $destkey
+        ls -lh $destkey }
 
     # Update algorithm if it was passed on the command line with -o
     { option_is_set -o } && { algopt="$(option_value -o)" }