meson: Fix typo in gsm header file name

This was wrong since commit c360ceea4deb5d56c94126e31b9614734e8c1a7e.

Also fix incorrect indentation (tab instead of spaces).

Found using hermetic builds with Nix:

    https://github.com/NixOS/nixpkgs/pull/54398#discussion_r280125735

diff --git a/ext/gsm/meson.build b/ext/gsm/meson.build
index ef58adf..8ead5d8 100644 (file)
--- a/ext/gsm/meson.build
+++ b/ext/gsm/meson.build
@@ -7,7 +7,7 @@ gsm_cargs = []
 gsm_dep = cc.find_library('gsm', required : get_option('gsm'))
 have_gsm_create = cc.has_header_symbol('gsm.h', 'gsm_create')
 if not have_gsm_create
-       have_gsm_create = cc.has_header_symbol('gsm/smg.h', 'gsm_create')
+  have_gsm_create = cc.has_header_symbol('gsm/gsm.h', 'gsm_create')
   if not have_gsm_create and get_option('gsm').enabled()
     error('GSM plugin is enabled: found libgsm but no headers')
   else