fixes typo in library location

thankfully only triggers on linux, if no packaged lib and no system
lib was found

Author: Bastian Bechtold

README.rst

@@ -344,3 +344,9 @@ News
     - Improves precompiled library location, especially with py2app or cx-freeze.
     - Now provide binary wheels for Linux x86_64
     - Now prefers packaged libsndfile over system-installed libsndfile
+
+2023-02-15 V0.12.1 Bastian Bechtold
+    Thank you, funnypig, for the bug report
+
+    - Fixed typo on library location detection if no packaged lib and
+      no system lib was found

soundfile.py

@@ -8,7 +8,7 @@
 For further information, see https://python-soundfile.readthedocs.io/.
 
 """
-__version__ = "0.12.0"
+__version__ = "0.12.1"
 
 import os as _os
 import sys as _sys
@@ -176,7 +176,7 @@
             _explicit_libname = 'libsndfile.dylib'
         elif _sys.platform == 'win32':
             _explicit_libname = 'libsndfile.dll'
-        elif _sys.plaform == 'linux':
+        elif _sys.platform == 'linux':
             _explicit_libname = 'libsndfile.so'
         else:
             raise