Fix braced initializer list (NFC)

After r270617 I am getting an error when building:

projects/compiler-rt/lib/profile/InstrProfilingFile.c:33:36:
error: missing field 'PidChars' initializer
[-Werror,-Wmissing-field-initializers]
lprofFilename lprofCurFilename = {0};
                                   ^

Fix the aggregate initializer.

llvm-svn: 270697

compiler-rt/lib/profile/InstrProfilingFile.c

@@ -30,7 +30,7 @@ typedef struct lprofFilename {
   unsigned NumHosts;
 } lprofFilename;
 
-lprofFilename lprofCurFilename = {0};
+lprofFilename lprofCurFilename = {0, {0}, {0}, 0, 0};
 
 int getpid(void);
 static int getCurFilenameLength();