Bug fix: ensure P4 "err" is displayed when exception is raised.

During "git p4 clone" if p4 process returns an error from the server,
it will store the message in the 'err' variable. Then it will send a
text command "die-now" to git-fast-import. However, git-fast-import
raises an exception: "fatal: Unsupported command: die-now" and err is
never displayed. This patch ensures that err is dispayed using
"finally:".

Signed-off-by: Fahad Alrashed <fahad@keylock.net>

git-p4.py

@@ -3253,17 +3253,19 @@ def streamP4FilesCb(self, marshalled):
             if self.stream_have_file_info:
                 if "depotFile" in self.stream_file:
                     f = self.stream_file["depotFile"]
-            # force a failure in fast-import, else an empty
-            # commit will be made
-            self.gitStream.write("\n")
-            self.gitStream.write("die-now\n")
-            self.gitStream.close()
-            # ignore errors, but make sure it exits first
-            self.importProcess.wait()
-            if f:
-                die("Error from p4 print for %s: %s" % (f, err))
-            else:
-                die("Error from p4 print: %s" % err)
+            try:
+                # force a failure in fast-import, else an empty
+                # commit will be made
+                self.gitStream.write("\n")
+                self.gitStream.write("die-now\n")
+                self.gitStream.close()
+                # ignore errors, but make sure it exits first
+                self.importProcess.wait()
+            finally:
+                if f:
+                    die("Error from p4 print for %s: %s" % (f, err))
+                else:
+                    die("Error from p4 print: %s" % err)
 
         if 'depotFile' in marshalled and self.stream_have_file_info:
             # start of a new file - output the old one first