logcat: build regression

printflike checks for NULL fmt at compile time, checks for
NULL at runtime are optimized out. Regression as a result
of commit 5976303aa6e55a9e81eadb35d50f458052e3fa24.

Change-Id: Ia4e7ee4b6cb2adf1e6609c70e79684855f76e6fc
diff --git a/logcat/logcat.cpp b/logcat/logcat.cpp
index 5db539f..2b19b93 100644
--- a/logcat/logcat.cpp
+++ b/logcat/logcat.cpp
@@ -342,12 +342,10 @@
 
 static void logcat_panic(bool showHelp, const char *fmt, ...)
 {
-    if (fmt) {
-        va_list  args;
-        va_start(args, fmt);
-        vfprintf(stderr, fmt,  args);
-        va_end(args);
-    }
+    va_list  args;
+    va_start(args, fmt);
+    vfprintf(stderr, fmt,  args);
+    va_end(args);
 
     if (showHelp) {
        show_help(getprogname());