strace: Don't try to extract syscall names if they're not going to be used.

completions/strace

@@ -33,8 +33,10 @@ _strace()
                     prev=${cur/=*/}
                     cur=${cur/*=/}
 
-                    # Import arch-specific syscalls -- not foolproof IMHO
-                    #+                                     --David Paleino
+                    case $prev in
+                        trace)
+                            # Import arch-specific syscalls
+                            #+ -- not foolproof IMHO --David Paleino
                             local arch=$(command uname -m)
                             local syscalls=$(awk '/^#define __NR/ {print $2}' \
                                 /usr/include/asm/unistd.h | sed -e \
@@ -50,8 +52,6 @@ _strace()
                                     $unistd | sed -e 's/__NR_//')
                             fi
 
-                    case $prev in
-                        trace)
                             COMPREPLY=( $( compgen -W "$syscalls file process
                                 network signal ipc desc all none" -- "$cur") )
                             return 0