This fixes several issues:
* typo "lugin_seagate_opts"
* "readonly" with assignment resulting in error on Bash 5.x

Gentoo bug: https://bugs.gentoo.org/852764
Upstream: https://github.com/linux-nvme/nvme-cli/pull/1574
Upstream: https://github.com/linux-nvme/nvme-cli/commit/25fd8c707b106ca0763402566ad657ef710bf09e

Author: Karlson2k (Evgeny Grin)
Signed-off-by: Karlson2k (Evgeny Grin) <k2k@narod.ru>

diff --git a/completions/bash-nvme-completion.sh b/completions/bash-nvme-completion.sh
index 5e0eb23b..469ba3e2 100644
--- a/completions/bash-nvme-completion.sh
+++ b/completions/bash-nvme-completion.sh
@@ -3,12 +3,13 @@
 # Kelly Kaoudis kelly.n.kaoudis at intel.com, Aug. 2015
 
 # Constant to indicate command has no options
-readonly NO_OPTS=""
+NO_OPTS=""
+readonly NO_OPTS
 
 # Associative array of plugins and associated subcommands
 # Order here is same as PLUGIN_OBJS in Makefile
 typeset -A _plugin_subcmds
-readonly _plugin_subcmds=(
+_plugin_subcmds=(
 	[intel]="id-ctrl internal-log lat-stats \
 		set-bucket-thresholds lat-stats-tracking \
 		market-name smart-log-add temp-stats"
@@ -53,10 +54,11 @@ readonly _plugin_subcmds=(
 	[nvidia]="id-ctrl"
 	[ymtc]="smart-log-add"
 )
+readonly _plugin_subcmds
 
 # Associative array mapping plugins to coresponding option completions
 typeset -A _plugin_funcs
-readonly _plugin_funcs=(
+_plugin_funcs=(
 	[intel]="plugin_intel_opts"
 	[amzn]="plugin_amzn_opts"
 	[memblaze]="plugin_memblaze_opts"
@@ -74,6 +76,7 @@ readonly _plugin_funcs=(
 	[nvidia]="plugin_nvidia_opts"
 	[ymtc]="plugin_ymtc_opts"
 )
+readonly _plugin_funcs
 
 # Top level commands
 _cmds="list list-subsys id-ctrl id-ns \
@@ -939,7 +942,7 @@ plugin_micron_opts () {
 	return 0
 }
 
-lugin_seagate_opts () {
+plugin_seagate_opts () {
     local opts=""
 	local compargs=""