Don't compare 4 characters on a 2 character string.

llvm-svn: 182540
diff --git a/lldb/source/lldb-log.cpp b/lldb/source/lldb-log.cpp
index 5ff9b7d..c53fa56 100644
--- a/lldb/source/lldb-log.cpp
+++ b/lldb/source/lldb-log.cpp
@@ -142,7 +142,7 @@
                 else if (0 == ::strncasecmp(arg, "symbol", 6))  flag_bits &= ~LIBLLDB_LOG_SYMBOLS;
                 else if (0 == ::strncasecmp(arg, "module", 6))  flag_bits &= ~LIBLLDB_LOG_MODULES;
                 else if (0 == ::strncasecmp(arg, "mmap", 4))    flag_bits &= ~LIBLLDB_LOG_MMAP;
-                else if (0 == ::strncasecmp(arg, "os", 4))      flag_bits &= ~LIBLLDB_LOG_OS;
+                else if (0 == ::strcasecmp(arg, "os"))          flag_bits &= ~LIBLLDB_LOG_OS;
                 else
                 {
                     feedback_strm->Printf ("error:  unrecognized log category '%s'\n", arg);
@@ -212,7 +212,7 @@
             else if (0 == ::strncasecmp(arg, "symbol", 6))  flag_bits |= LIBLLDB_LOG_SYMBOLS;
             else if (0 == ::strncasecmp(arg, "module", 6))  flag_bits |= LIBLLDB_LOG_MODULES;
             else if (0 == ::strncasecmp(arg, "mmap", 4))    flag_bits |= LIBLLDB_LOG_MMAP;
-            else if (0 == ::strncasecmp(arg, "os", 4))      flag_bits |= LIBLLDB_LOG_OS;
+            else if (0 == ::strcasecmp(arg, "os"))          flag_bits |= LIBLLDB_LOG_OS;
             else
             {
                 feedback_strm->Printf("error: unrecognized log category '%s'\n", arg);