Fix typo: PSYM_ENUMSOURCEFILES_CALLBACK instead of
PSYM_ENUMSOURCFILES_CALLBACK.

diff --git a/include/imagehlp.h b/include/imagehlp.h
index 00fff57..1e3c3ad 100644
--- a/include/imagehlp.h
+++ b/include/imagehlp.h
@@ -366,7 +366,7 @@
   PSYMBOL_INFO pSymInfo, DWORD SymbolSize, PVOID UserContext
 );
 
-typedef BOOL (CALLBACK *PSYM_ENUMSOURCFILES_CALLBACK)(
+typedef BOOL (CALLBACK *PSYM_ENUMSOURCEFILES_CALLBACK)(
   PSOURCEFILE pSourceFile, PVOID UserContext
 );
 
@@ -554,7 +554,7 @@
 );
 BOOL WINAPI SymEnumSourceFiles(
   HANDLE hProcess, DWORD ModBase, LPSTR Mask,
-  PSYM_ENUMSOURCFILES_CALLBACK cbSrcFiles, PVOID UserContext
+  PSYM_ENUMSOURCEFILES_CALLBACK cbSrcFiles, PVOID UserContext
 );
 BOOL WINAPI SymEnumSymbols(
   HANDLE hProcess, DWORD BaseOfDll, PCSTR Mask,