Spelling fixes

Spelling errors found using github.com/lucasdemarchi/codespell
A tool to fix common misspellings.
This tool is licensed under GNU General Public License, version 2.

Change-Id: I78e9d126f19fd9fb2e3f2fa9fe8c2404dc505f82
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/groupext.cpp b/groupext.cpp
index 6891d75..5695d07 100644
--- a/groupext.cpp
+++ b/groupext.cpp
@@ -14,7 +14,7 @@
     ipmi_ret_t rc = IPMI_CC_OK;
     uint8_t *p = (uint8_t*) response;
 
-    printf("IPMI GROUP EXTENTIONS\n");
+    printf("IPMI GROUP EXTENSIONS\n");
 
     *data_len = 1;
     *p = 0;